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A blue synthetic coal tar dye often used in conjunction with Tartrazine, to produce various shades of green.
| brilliant blue fcf | |
| C.I. No. | 42090 |
| FD&C No. | Blue 1 |
| E.E.C No. | E 133 |
| C.I. Food Colour No. | Blue 2 |
| C.A.S No. | 3844-45-9 |
| Chemical Name | Disodium Salt of 4-{4-(N-Ethyl-P-Sulfo benzyl-amino)- Phenyl} - (2-Sulphonium - Phenyl)- Methylene ] - {1- (N-Ethyl- N-P-Sulpho-Benzyl)- 2,5- Cyclohexadienimine} |