The pinkish component of the crude benzoic acid crystals is the presence of impurities.
Benzoic acid is a white colourless solid or crystals that can be gotten naturally from gum benzoin, also known as benzoin resin or Benjamin gum, a brown resin found in the benzoin tree of Southeast Asia.
During the laboratory extraction of benzoic acid crystals, the crystals begins to form when solution cools down because of solubility.
Final products of crystallization will lead to the formation of white and shiny crystals. The presence of impurities will make the crystals pink in colour.
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