Editorial use only.
Column chromatography. Chemist using column chromatography equipment to separate out the constituents of coal tar. Chromatography is used to separate out the various components of a liquid mixture. A porous substance is place in the column and the sample to be analysed is poured on top of it. The different components of the mixture travel down the column at different rates, allowing them to be individually collected. Photographed in the 1950s.
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