The colors of sorghum grain and flour play an important role in its acceptance. In general,
white sorghums produce the most acceptable colored food products. Food color is the result of
factors such as grain color, pericarp color, pigmented testa, endosperm color, presence of tannins,
degree of milling, and pH of the food system. Pigmentation in the pericarp and testa is primarily
due to phenolic compounds. The color intensity greatly depends on pH. Anthocyanins are very
unstable in acid medium and are readily converted to the corresponding anthocyanidin under
slight acidic conditions (Hahn and Rooney 1986).