Syonyms Name: C.I. 24400; C.I. Direct Blue 15; C.I. Direct Blue 15, tetrasodium salt; C.I. Direct Blue 15 (8CI); Direct Blue 15; Direct sky blue; Direct Turquoise Blue 5B; tetrasodium (3E,3'E)-3,3'-[(3,3'-dimethoxybiphenyl-4,4'-diyl)di(1E)hydrazin-2-yl-1-ylidene]bis(5