Project reporting in FP6 - constglass.fraunhofer.de€¦ · Project reporting in FP6. Project no....

Project reporting in FP6

Project no. 044339

CONSTGLASS

Conservation materials for stained glass windows – assessment of treatments, studies on reversibility and performance of innovative restoration strategies and products

Specific Targeted Research Project

FP 6 Thematic Priority 8.1: Policy-oriented research

Object data Part IV of IV

The Burrell Collection, Glasgow (Scotland) Burgdorf (Canton Bern, Switzerland)

Academy of Fines Arts, Krakow (Poland)

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Data sheet for pilot objects

Cecily Page 1 of 11

Object: Princess Cecily panel Date: June 2010

OBJECT IDENTIFICATION

Site Burrell Collection, Glasgow

Building Burrell Collection

Location and orientation of the window Plan of the building

In storage

Description of the window opening (dimensions, number of lights; photo, test panel marked)

Not relevant

Date c. 1483

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Cecily Page 2 of 11

Short description of the window (identification of subject, artist, workshop)

This small rectangular panel, c.1483, now part of the Burrell Collection, was originally placed at the bottom of the Royal Window in the north-west transept of Canterbury Cathedral, beside the donor-portraits of her parents (Edward IV and Elizabeth Woodville), her two brothers and four sisters, who were alive when the window was being made. On 13 December 1643, following Ordinances issued in parliament earlier that year the window was razed to the ground. The Cecily panel survived and was eventually purchased by Sir William Burrell. The panel was restored in 1975: the photographs, taken in 2010, show the panel in its present condition.

Owner City of Glasgow

Person(s) in charge Director, Glasgow Museums

Investigated panel (inventory number CVMA number, size)

Princess Cecily (Burrell Collection, Glasgow. Reg. No. 45/75). 39.4cm x 29.8cm

Manufacturing technique

unpainted glazing

painted glazing x

oxide paint / grisaille paint inside x

oxide paint / grisaille paint outside

silver stain inside x

silver stain outside

transparent enamel inside

transparent enamel outside

.......................................

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Cecily Page 3 of 11

.......................................

Further information:

ENVIRONMENT IN SITU / IN STORAGE

Protective glazing

no protective glazing Not relevant

protective glazing

installed in the original position of the ancient panels

mounted to the outside (ancient panels stay in their original position)

no ventilation

internal ventilation

external ventilation

size of interspace between ancient panel and protective glazing

cm

ventilation slot at the top (size) cm

ventilation slot at the bottom (size) cm

date of installation


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Cecily Page 4 of 11

Material protective glazing Not relevant

Surround materials and construction related materials

Not relevant

Museal exposition / Storage

Room

Cabinet

Store x


Objects exposed to

partial sunlight

daylight, but no direct sunlight

artificial warmlight

artificial coldlight X

mixed warm-/coldlight

Previously exposed to artificial coldlight in Burrell Collection

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Cecily Page 5 of 11

Climate of the building

The building has a HVAC system

Further information / observations:

No data for period on display

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Cecily Page 6 of 11

INSPECTION OF THE SITE BEFORE REMOVAL (WITH PICTURES)

Requirements for a safe removal in respect of minimal intervention

Not relevant

Environmental causes for damage

Not relevant

Short report of removal

Not relevant

Short report of transport Not relevant

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Cecily Page 7 of 11

CONSERVATION MATERIAL

Conservation material (producer, product name, characterization, data, etc.)

Araldite AY103/HY951 epoxy resin supplied by Ciba Geigy Ltd.

Purpose of use consolidation of paint layer / paint pigments

coating / lamination

edge bonding x

gap-filling……………… x

………………

………………

Application technique

application with brush application with spray

single application

repeated application times

concentration %

mixing ration :

..........................

..........................

Further information :

Standard edge-bonding and gap-filling methods – but no precise documentation

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Cecily Page 8 of 11

Date of application

1975

Documentation of this treatment

photographs (colour transparences, b&w prints, colour prints, digital images) x

written records x

diagrams x

data-files

...........................

...........................


Do you think this documentation is

exact x

more or less reliable

Previous restorations (data, treatments, material)

Documentation indicates previous plating of broken fragments with several stop-gaps

Do you think the information is

exact more or less reliable x hearsay

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Cecily Page 9 of 11

CONDITION REPORT / DOCUMENTATION IN THE WORKSHOP

Pictures of panel / glass in transmitted light

Pictures of panel / glass in reflecting and raking light, internal and external surface

Examination of the object (if possible with microscope)

Study focused on repair materials only – they showed excellent durability after 35 years.

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Cecily Page 10 of 11

Selected damages

Filled (1 and 2 above, 3 below) and bonded (3 above) areas showing good appearance after 35 years

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Cecily Page 11 of 11

Selection and documentation of samples to be analysed Questions to the scientists

Not relevant

Selection and documentation of areas for reversibility tests or reactivation tests

Not relevant

RESPONSIBLE CONSERVATORS (name, phone, e-mail)

Person 1

Marie Stumpff ([email protected]) – responsible conservator at the Burrell Collection

Person 2

Norman Tennent (normantennent @yahoo.co.uk) – involved with examination

Person 3

mailto:[email protected]�

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ObjectData Burgdorf Fragment Page 1 of 16

Object: REF. PARISH CHURCH, TEST - GLASS Date: 12.01.2009


Site Burgdorf BE (Switzerland)

Building Ref. Parish Church


Vestry south of the choir


Panel of fragments

Total height: ca. 79 cm Total width: ca. 40 cm

The panels have been installed in the sacristy about in 1971.

Date Panel of fragments: 1st decade of 16th century

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The original window of the late 15th or early 16th century has been destroyed by a hailstorm in 1707. The fragments of the panel have been found in 1968 behind the choir stalls. Konrad Vetter mounted the fragments in 1971 for the vestry.

Owner Ref. parish church of Burgdorf

Person(s) in charge Vitrocentre Romont, Stefan Trümpler / Aline Dold



unpainted glazing

painted glazing

oxide paint / grisaille paint inside


silver stain inside




flashed glass relief

.......................................


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Protective glazing

no protective glazing

protective glazing



no ventilation




ca. 4 cm



date of installation ca. 1971


No data logger is necessary for this case.

There is no ventilation between the protective glazing and the panel, but there may have been a slight air exchange through the framing and the leaded panel.

Clear evidence for thermal damage due to the double-glazing.

Influence of acid from the oak frames is highly probable in the interspaces.

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Material protective glazing

Transparent float glass


The building material is sandstone.

Around the panel: Oak-timber frame with saddle bars.

On the fragment panel we found some blurs of white paint (could be wall paint).


Room

Cabinet

Store


The vestry is a small room of about 25 square meters with a carpet.

Two artificial warm light lamps (filament lamps) on the walls, one of them between the test panels, about 100cm distance.

Objects exposed to

partial sunlight



artificial coldlight


Note:

Filament lamps

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The climate in the vestry of the parish church is rather humid and moderately heated. The wall shows signs of humidity, at some places the wall plaster is peeling off. Occasionally, condensation occurs in the inter space of the glazing, leaving marks on the window frames. (Pict. 2).

On the day of the removal, 7th November 2007, the temperature was 14 0C / 57%rh (inside-), 10 0C / 80%rh (outside the sacristy).

Picture 1

Picture 2

Further information / observations: records of previously collected data, for example

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The object has been transported horizontally and has not been touched at any time on its surface.

The window level is about 130 cm off the ground.


The panel is slightly bending due to heat dilatation. A small timber wedge had been applied under the lower lead bar, which caused a deformation of the panel.

The objects are exposed to UV-Light, through a 3mm-float glass.

Around the fragments, K. Vetter used some glass colored with manganese. This glass has changed color (to violet), according to its exposure to UV. The upper border, which has certainly less sunlight, is less affected.

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The panel was fixed in a timber frame with wooden strips.

For an easy removal, the front frame holding the protective glazing was fixed with two screws. The wooden strips around the glass panel were fixed with nails.

Two iron bars are fixed on the outside of the panel.

There is sawdust in the inter space.

Outside of the protective glazing, protective ferramenta.

Short report of transport The objects have been transported in a timber frame with Styrofoam and neutral cotton/molton tissue.

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Araldite® binder AY103 by 100 parts, hardener HY951 by 9 parts (Astorit AG 8840 Einsiedeln). Hardening at 22 0C during 24h.

Purpose of use

consolidation of paint layer / paint pigments

coating / lamination / doubling

edge bonding

………………

………………

………………


application with brush

application with spray

single application

repeated application yes

concentration %

mixing ration of Araldite® AY103 / HY951 100:9

..........................

..........................


According to documents of Konrad Vetter, the fragments have probably been thoroughly cleaned, especially on the unpainted backside. Single fractures were scotch taped on the painted surface (A). Then the crack was opened for inserting the Araldite® (B). The remaining Araldite® was removed with acetone.

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For thin fragments (1-1.5mm) with multiple fractures, the simple edge bonding was not considered to be sufficient. The doubling method was used. A thin carrier glass was cut and sometimes reheated in a plaster mould taken from the original fragment. Araldite® was poured on the carrier glass, the fragment was then put on top and left under pressure with a weight, for 24 hours/22 °C. The resin coming out all around the doubled glass has been removed with a sharp blade after 6-7 hours.

original glass

araldite

carrier glass

Date of application

About 1971


photographs (colour transparences, b&w prints, colour prints, digital images)

written records

diagrams

data-files

...........................

...........................


The written records of the methods used by the restorer K. Vetter are kept in the archives of the Vitrocentre and are analyzed for the project. Oral recordings are also be available

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The (identical) treatment of the second panel has been documented with photographs in 1971


Exact more or less reliable


.


exact more or less reliable hearsay

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Lighting: Fluorescent tube inside the workbench (Lumilux Daylight). All digital photos in this data sheet : Nikon D-90

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Pictures of panel in reflecting and raking light, internal surface.

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Pictures of panel in reflecting light, external surface.

Examination of the Detailed phenomenological optical analysis will be performed.

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object (if possible with microscope)

Short: The glass is in stable condition. On the (laminated as well as open) external surfaces some pitting corrosion.

The paint is stable. Some paint loss.

The lead is a perfect condition. The putty is in a good condition.

The Araldite® is yellowing and in some places looses adhesion / flakes off, showing clearly different types of deterioration.

Selected damages

fragment without doubling / pitting corrosion

selected damages for samples / pitting corrosion in Araldite®

Selection and documentation of samples to be

Is there a difference between the pitting corrosion with Araldite® and without?

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analysed Questions to the scientists

What is the impact of the resin on the glass surface and panting?


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Person 1 Stefan Trümpler

Phone: +41 26 652 18 34

e-mail: [email protected]

Person 2

Aline Dold

phone: +41 79 662 90 38

e-mail: [email protected] / [email protected]


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ObjectData Burgdorf Heraldic Page 1 of 17

Object: REF. PARISH CHURCH, TEST - GLASS Date: 12.01.2009


Site Burgdorf BE (Switzerland)

Building Ref. Parish Church


Vestry south of the choir


Heraldic stained glass panel

Total height: ca. 79 cm Total width: ca. 40 cm

The panels have been installed in the sacristy about in 1971.

Date Heraldic stained glass panel: 1555

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The single stained glass panel bears the coat of arms and inscriptions of the brothers Niklaus II and Hans-Rudolf Manuel, well known Bernese glass-painters of the sixteenth century. The panel has been donated to the church in 1869. The stained glass panel is supposed to have been executed by Niklaus II Manuel.

Owner Ref. parish church of Burgdorf

Person(s) in charge Vitrocentre Romont, Stefan Trümpler and Aline Dold



unpainted glazing

painted glazing

oxide paint / grisaille paint inside


silver stain inside




flashed glass relief

.......................................


The transparent enamel has no back-plating glass.

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Protective glazing

no protective glazing

protective glazing



no ventilation




ca. 4 cm



date of installation ca. 1971


No data logger is necessary for this case.

There is no ventilation between the protective glazing and the panel, but there may have been a slight air exchange through the framing and the leaded panel.

Clear evidence for thermal damage due to the double-glazing.

Influence of acid from the oak frames is highly probable in the interspaces.

CONSTGLASS




Transparent float glass


The building material is sandstone.

Around the panel: Oak-timber frame with saddle bars.

On the fragment panel we found some blurs of white paint (could be wall paint).


Room

Cabinet

Store


The vestry is a small room of about 25 square meters with a carpet.

Two artificial warm light lamps (filament lamps) on the walls, one of them between the test panels, about 100 cm distance.

Objects exposed to

partial sunlight



artificial coldlight


Note:

Filament lamps

CONSTGLASS




The climate in the vestry of the parish church is rather humid and moderately heated. The wall shows signs of humidity, at some places the wall plaster is peeling off. Occasionally, condensation occurs in the inter space of the glazing, leaving marks on the window frames. (Pict. 2).

On the day of the removal, 7th November 2007, the temperature was 14°C / 57% rh (inside-), 10°C / 80% rh (outside the sacristy).

Picture 1

Picture 2

Further information / observations: records of previously collected data, for example

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The object has been transported horizontally and has not been touched at any time on its surface.

The window level is about 130 cm off the ground.


The panel is slightly bending due to heat dilatation. A small timber wedge had been applied under the lower lead bar, which caused a deformation of the panel.

The objects are exposed to UV-Light, through a 3 mm-float glass.

Around the fragments, K. Vetter used some glass coloured with manganese. This glass has changed colour (to violet), according to its exposure to UV. The upper border, which has certainly less sunlight, is less affected.


The panel was fixed in a timber frame with wooden strips.

For an easy removal, the front frame holding the protective glazing was fixed with two screws. The wooden strips around the glass panel were fixed with nails.

Two iron bars are fixed on the outside of the panel.

There is sawdust in the inter space.

Outside of the protective glazing, protective ferramenta.

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Short report of transport

The objects have been transported in a timber frame with Styrofoam and neutral cotton/molton tissue.



Araldite® binder AY103 by 100 parts, hardener HY951 by 9 parts (Astorit AG 8840 Einsiedeln). Hardening at 22°C during 24 h.

Purpose of use

consolidation of paint layer / paint pigments

coating / lamination / doubling

edge bonding

………………

………………

………………


application with brush

application with spray

single application

repeated application yes

concentration %

mixing ration of Araldite® AY103 / HY951 100:9

..........................

..........................

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According to documents of Konrad Vetter, the fragments have probably been thoroughly cleaned, especially on the unpainted backside. Single fractures were scotch taped on the painted surface (A). Then the fracture was opened for inserting the Araldite® (B). The remaining Araldite® was removed with acetone.

For thin fragments (1-1.5mm) with multiple fractures, the simple edge bonding was not considered to be sufficient. The doubling method was used. A thin carrier glass was cut and sometimes reheated in a plaster mould taken from the original fragment. Araldite® was poured on the carrier glass, the fragment was then put on top and left under pressure with a weight, for 24 hours/22°C. The resin coming out all around the doubled glass has been removed with a sharp blade after 6-7 hours.

Date of application

About 1971


photographs (colour transparencies, b&w prints, colour prints, digital images)

written records

diagrams

data-files

...........................

...........................


The written records of the methods used by the restorer K. Vetter are kept in the archives of the Vitrocentre and are analyzed for the project. Oral recordings will also be available

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The treatment of a major piece of this panel has been used as an example in the documentation of Konrad Vetter on his using of resins for stained glass conservation:

Short: A neutral glass was covered with a foil, to protect the painted surface of the original piece was prepared with a foil too. The Araldite® was applied to the glass and the original was slowly placed on the resin layer. The sandwich was compressed smoothly to have a thin Araldite® film and fixed with a cello tape.

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The resin around the doubling glass piece was removed with the foil after 6-7 hours. Araldite® on the edge was cleaned with a sharp blade.

Cello taped

Original glass piece

Neutral glass

Araldite®


Exact more or less reliable



exact more or less reliable hearsay

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Lighting: Fluorescent tube inside the workbench (Lumilux Daylight). All digital photos in this data sheet : Nikon D-90

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Pictures of panel in reflecting and raking light, internal surface.

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Pictures of panel in reflecting light, external surface.


Detailed phenomenological optical analysis will be performed.

Short:

The glass is in stable condition. On the (laminated as well as open) external surfaces some pitting corrosion. No pitting corrosion on the external surface.

The paint and leading are in very good condition.

The Araldite® is yellowing and in some places looses adhesion, showing different degrees and types of deterioration. For a better understanding see the sketch below:

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Is still bonded

. . . the bonding is losing

the bonding is losing from a transaction of movement.

friable Araldite®

Selected damages

doubled piece of glass

doubled piece of glass with cracked Araldite®

selected damage for sample

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Selection and documentation of samples to be analysed Questions to the scientists

Why are there different degrees of yellowing of Araldite® in an intact doubling?

Reasons for the different stages of adhesion, flaking and cracking of the resin layers?

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Reasons why the resin has not been yellowing in a particular area?

What can affect the adhesion of the Araldite®? And how is it possible to separate the Araldite® from the original glass, without any damages (reversibility)?

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Person 1 Stefan Trümpler +41 26 652 18 34 [email protected]

Person 2

Aline Dold +41 79 662 90 38 [email protected] / [email protected]


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Smolensk 9 st. Page 1 of 16

Object: Smolensk 9 st. – pilot object Date: 15.05.2008


Site Cracow (Poland)

Building Smolensk 9 (former Industrial Museum)

Location and orientation of the window

Plan of the building

N

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Three separate windows:

A- groud floor (pilot object) dim: x=90 cm; y=160 cm

B - first floor: dim: x=90 cm; y=240 cm

C - third floor: dim: x=90 cm; y=400 cm

Pilot window and pilot panel marked yellow

A

B

C

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Date 1913


The building designed by T.Stryjenski (structure), J. Czajkowski (facade, staircase); W. Jastrzębowski (furnishings), Jan Uziębło: stained glass windows in the staircase. Workshop: Krakow Stained Glass Company S.G. Żeleński (in existence since 1902).

Owner Academy of Fine Arts, Cracow, Poland

Person(s) in charge The Rector of the Academy of Fine Arts


A1, dim: 44 x 80 cm

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unpainted glazing rolled and colored glass +

painted glazing -

oxide paint / grisaille paint inside -

oxide paint / grisaille paint outside -

silver stain inside -

silver stain outside +

transparent enamel inside -

transparent enamel outside -

.gilding outside +

special leading +

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Further information :In Smolensk windows the artistic values were

created by using: special rolled glass (fig.1), carved leading (fig.2), gilding form outside

fig.1 decorative cathedral glass

fig. 2 carved load came fig. 3 gilded glass (outside)


Protective glazing

no protective glazing +

protective glazing -

installed in the original position of the ancient panels -


-

no ventilation -

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internal ventilation -

external ventilation -


n.a.

ventilation slot at the top (size) n.a.

ventilation slot at the bottom (size) n.a.

date of installation n.a.




Window’s surround – sandstone, brick Ferramenta – iron, saddle bars – iron from outside). Protective grilles – NO Sealant: linseed putty Leading – 95 years old. Low strength, local breaks– crumbling Treatment from beginning of window’s existence - none


Room n.a.

Cabinet n.a

Store n.a Further information:

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Objects exposed to

partial sunlight -

daylight, but no direct sunlight +

artificial warmlight -

artificial coldlight -

mixed warm-/coldlight -

Note:


No data on climate available. Personal feeling suggest that interior climate is quite favorable for human beings. Central heating installed, also on the staircase, but far from the windows.

Outside climate rather humid (mean RH value about 70%).

As the window is north oriented and screened by surrounding walls, no direct sunlight reaches it. thus humidity may be higher and more stable than on the open terrain.

The test window is situated on the ground floor , thus no direct water or snow reaches it. Some wetting from outside possible from splash water .

No condensation observed.

The man-made damages possible due to low ledges, possiblity of sitting on them and leaning on lowest panels

Further information / observations:

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1. Dismantling from outside and inside 2. Three persons needed 3. Sealant crumbling and missing 4. Due to panels design do not bend! 5. Since leading is nearly one hundred years old, may be very weak. 6. No scaffolding necessary


Air pollution – gaseous and solid

Splash water from outside

Higher humidity - due to orientation and isolation


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The test panel was removed by three persons. After removing the sealing putty (hard, but crumbling easily) with chisel, the saddle bars were removed and the panel dismantled. No particular problems occurred. The opening was temporary protected with cathedral glass

Short report of transport As the test site is situated close to the conservation laboratory no special packing was required. It was transported with a car, in a boot. Panel was laid flat on the soft particleboard, protected from the top with another one and secured with a tape. The whole transportation took 5 minutes.

The surface of the test panel was neither treated nor touched.

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According to oral information repairs of broken glass were made without dismantling from inside with Polish epoxide resin: Epidian 53 (or 55).

Other materials has not been found

Below are given basic data on this still produced material.

Z.CH. “Organika-Sarzyna”, ul. Chemików 1 37- 310 Nowa Sarzyna, Poland

Epoxside resin: Epidian (probably Epidian 53) Epidian epoxy resins are the Bisfenol A ((CH3)2C(C6H4OH)2) and epichlorohydryn (C3H5ClO) based Resin: Epidian 53

Colour: colourless to light yellow

: solution of resin Epidian 5 (molecular mass <700) in non active solvent

Hardener Z-1

Composition: mixture of isomers of tri-ethylene-tetra-amine [CH2NHCH2CH2NH2]2. molecular formula: C6H18N4 IUPAC name: N,N'-bis(2-aminoethyl)ethane-1,2-diamine no. CAS: 112-24-3 Harmful

Selected resistance parameters of resins after curing Data for Epidian 5 were added for comparison as it is the main

component of Epidian 53 Epidian epoxy resins are the Bisfenol A ((CH3)2C(C6H4OH)2) and epichlorohydryn (C3H5ClO) based Resin: Epidian 53: solution of resin Epidian 5 (molecular mass <700) in non active solvent Colour: colourless to light yellow Hardener Z-1 Composition: mixture of isomers of tri-ethylene-tetra-amine [CH2NHCH2CH2NH2]2. molecular formula: C6H18N4 IUPAC name: N,N'-bis(2-aminoethyl)ethane-1,2-diamine no. CAS: 112-24-3 no.WE: 203-950-6 Symbol: C, Xn Harmful Epidian 53 was popular in Poland for stone conservation (structural reinforcement), now not in use. Also as adhesive for stone and other inorganic materials, glass including. To my best knowledge never used as a coating for glass.

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Purpose of use consolidation of paint layer / paint pigments -

coating / lamination -

edge bonding +

………………

………………

………………


application with brush +

application with spray -

single application +

repeated application times

concentration 95%

mixing ration 100:10

..........................

..........................


resin was applied from inside only, without dismantling either panels nor glass. The resin has not penetrated into to the break well , leaving it opened from outside.

Date of application

seventies - eighties of 20th c. (?). No written records.

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photographs (colour transparences, b&w prints, colour prints, digital images) -

written records -

diagrams -

data-files -

........................... -

........................... -



exact n.a more or less reliable n.a hearsay

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10_ObjectData_KRA_AFA.doc Page 13 of 16


e.g. releading, surface cleaning, edge-bonding, consolidation of painted decoration, puttying, etc. Give date and treatment method, available records; possibly interview retired staff.

No restorations performed. Perhaps washing from inside by cleaning ladies


exact - more or less reliable - hearsay +



Daylight. Due to weak leading part of the test panel had to be dismantled.


Fluorescent- daylight external surface


Glass not visually corroded on neither side. Dark deposits (soot, industrial dust) outside. Dirt (domestic dust) from inside. Traces of its cleaning with wet rag.

Sealing putty partly missing, crumbling.

Leading too thin for such a panel. Locally broken. Very weak.

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Selected damages

.

dirt accumulation from the outside panel bending

broken lead came and crumbling broken glass repaired with epoxide

putty

Selection and documentation of samples to be analysed

Questions to the scientists

Sample 1

sample 1 1

sample 2 2

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Glass bonded with epoxide resin – Epidian 53. Strongly yellow, bonding completely lost .

Questions:

a. recent compostion (as compared to modern resin, still available)

b. reversibility tests

2.

test glass transmitted light adhesive transmitted adhesive reflected

a . delamination phenomena

b. dirt accumulation


sample 2

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