Pigments that occur when dissolved organic dyes are precipitated with metal salts. This causes the dyes to form complex insoluble compounds with the metal ions. By using different metals, different colored pigments are produced with one dye. Precipitating the dye alizarin with aluminum salts produces red madder lake (or Turkish red). Tin, chromium and iron produce scarlet, brown and violet pigments respectively. Additional substances which have no color in themselves are also involved in the synthesis of some color lakes, e.g. aluminum hydroxide (Al(OH)3) for red madder lake.
- Color Lake