Patent Blue V, also called Food Blue 5, Sulphan Blue, Acid Blue 3, L-Blau 3, C-Blau 20, Patentblau V, Sky Blue, or C.I. 42051 and is a dark bluish synthetic triphenylmethane dye used as a food coloring. As a food additive, it has E number E131. It is a sodium or calcium salt of [4-(α-(4-diethylaminophenyl)-5-hydroxy- 2,4-disulfophenylmethylidene)-2,5-cyclohexadien-1-ylidene] diethylammonium hydroxide inner salt.[clarification needed]; It is not widely used, but in Europe it can be found in Scotch eggs, certain jelly sweets, blue Curaçao, certain jello varieties (though not in actual Jell-O brand products), among others. An important advantage is the very deep color it produces even at low concentration, a disadvantage is that it fades fairly quickly when exposed to light.

CAS：3536-49-0
中文别名：专利蓝Ⅴ;
英文别名：patent blue V;Merantine Blue V;Acid Blue 3 calcium salt,Acid Blue V calcium salt,Food Blue 5;Patent Blue V and L;Solar Pure Blue VX;C.I. Acid Blue 3;Carmine Blue V;Schultz No. 826;Blue ZN 3;Acid blue 3;Patent Blue V calcium salt;Acidal Carmine V;
分子式：C54H62CaN4O14S4
分子量：1159.43
精确质量：1158.28
Psa：315.28
Logp：11.2588

UNII：8QE473DV1Z

外观与性状：暗蓝色粉末
熔点：>300ºC

安全说明：S22; S24/25
危险类别码：R40

用途
食用蓝色色素。