PINCHED BURNISHED BIRD

QuickTime™ and aTIFF (Uncompressed) decompressor

are needed to see this picture.

QuickTime™ and aTIFF (Uncompressed) decompressor

are needed to see this picture.

QuickTime™ and aTIFF (Uncompressed) decompressor

are needed to see this picture.

QuickTime™ and aTIFF (Uncompressed) decompressorare needed to see this picture.

QuickTime™ and aTIFF (Uncompressed) decompressorare needed to see this picture.

Working with simplified form.

Studio Procedures

LockersAvailable on a first come first served basis.Sign up with a partner. Check locker first.

Clay is available for purchase.

Recycle= $3.50 Earthenware = $6.50 Stoneware = $6.50 Porcelain - $7.50

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We use one cone 6 terracotta and everything else is cone 10.

NO LOWFIRE CLAY

Getting Started With Clay

What is clay? How is it different than just dirt?

Al2O3 2SiO2 2H2O

Clay Origins

Clay is decomposed granite.The closer to the source, the purer the clay. Kaolin, the main ingredient of porcelain is the purest known clay. Earthenware has the lowest melting point, it has journeyed the furthest.

Clay Properties• Plasticity – the

property of being able to be molded and retain shape,slippery

• Shrinkage – cracks as it shrinks

• Refractory – resists melting, resists acid

• Transforms – heat chemicals changes into permanent shape

• Plasticity – Ball clays most plastic

• Shrinkage – Grog, sand or temper is added to reduce shrinkage & cracking

• Refractory – many earthenwares will melt

• Transformation – clay becomes permanent around 1000deg during bisque (porous)

Categories of Clay Bodies

• Earthenware – low fire, porous, grey-red terracotta (cone 6)

• Stoneware – mid to high fire, many colors buff, b-mix, stout, 612, S. Barbara

• Porcelain – most refractory, resistant to acid, whitest (colors look best on)

glacia, pier, coleman

The difference between stoneware, porcelain, earthenware.

Temperature (melting point)

Texture (grog, sand)

Ingredients (flux, temper, colorant)

Color

• Which is which: Glacia, B-Mix, Buff,Terracotta, Stout…

Safety Reminders

• Wear appropriate clothing

• Minimize toxic exposure– Use gloves or stir sticks

• Dust is the enemy.– Use a mask– Work in a well ventilated area (outside)– Minimize (sand on paper, toss whole thing)– Wet sponge as often as possible

Techniques for successful throwing.

• 1) Clay prep• A) Moisture – not too wet, not too dry• B) Wedging – even distribution of particles

• 2) Centering

• 3) Appropriate speed control

• 4) Knowing what shape you want

• 5) Finishing piece in timely fashion

What is a pyrometric cone?

Rank coolest to hottest -- 6, 06, 10, 04

At what cone do we:bisque

mid-rangeraku

high-fire?

2) Creating Form and Surface

• Form is the shape of an object, including its internal space, surrounding space and negative space. Negative space is the space between solid shapes.

• The subject of the form may be abstract, realistic, functional/utilitarian, non-functional, vessel or sculpture.

• Surface treatments include texture, oxide, slip designs, and glaze/no glaze.