PURPOSE: To color a baked cake to bright and clear red color having excellent heat and light resistance by using a pigment extracted from common madder.

CONSTITUTION: Root of common madder, tissue-cultured cell of common madder and/or cultured hair root of common madder are extracted with water or hydrated alcohol and the obtained pigment is hydrolyzed. Baked cake is colored to red color by a red pigment composition composed of the above pigment, alums, organic acid salts and carbonates. The colored baked cake exhibits bright and clear red color having excellent heat resistance and light resistance.