The vast majority of pure organic chemicals are colorless or a light shade of yellow. Occasionally a chemical reaction will produce high molecular weight ly-products that are highly colored. The impurities can be absorbed onto the surface of activated charcoal by simply boiling the solution with charcoal. Activated charcoal has an extremely large surface area per gram (several hundred square meters) and can bind a large number of molecules to this surface. On a commercial scale the impurities in brown sugar are adsorbed onto charcoal in the process of refining sugar.
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