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Why is BISMARCK BROWN Y brown in colour?
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Bismarck brown Y is a small molecule chemical dye. It is composed of a central benzene ring attached to two other benzene rings via azo groups, or nitrogen nitrogen double bonds. Because of all of these aromatic pi cloud electrons, bismarck brown Y has interesting light absorbance properties. As a result, the chemical can absorb all wavelengths of visible light except a combination that produces the color brown. Brown is a tertiary color resulting from a mix of three colors cyan, magenta, and yellow. So the other colors are absorbed and the mix of brown is reflected from the chemical, thus giving the brown appearance.
Posted by ncchemist on March 12, 2013 at 12:10 AM (Answer #1)
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