div class=trans-pagebutton class=gotoPage data-page=1Page 1button div class=trans-imagea href=https:reader042fdocumentsinreader042viewer2022020522575067ef1a28ab0f07add41fhtml5page1jpg target=_blank img data-url=documenta-new-method-for-the-observation-of-zones-of-colourless-substances-on-a-chromatographichtmlpage=1 data-page=1 class=trans-thumb lazyload alt=Page 1: A New Method for the Observation of Zones of Colourless Substances on a Chromatographic Column loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAQAAAC1HAwCAAAAC0lEQVR42mM8Uw8AAh0BTZud3BwAAAAASUVORK5CYII= data-src=https:reader042fdocumentsinreader042viewer2022020522575067ef1a28ab0f07add41fhtml5thumbnails1jpg width=140 height=200 adivp©1947 Nature Publishing Grouppdiv