BACK TO FOOD COLORS

COMMON NAME

COMMON NAME                                                 :            FAST RED  

SYNONYMS                                                           :            (A)   C.I.  FOOD RED 4

                                                                                                (B)  TOMATO   RED

C. I. NUMBER                                                        :             16045

CHEMICAL NAME                                                :             DISODIUM SALT OF 1-(4-SULPHO NAPHTHY 1 AZO)  

                                                                                                  2 -HYDROXY  - 6 SULPHONIC ACID

EMPIRICAL FORMULA                                       :            C20 H12 O7 S2 N2 NA2

MOLECULAR WEIGHT                                        :             502

SOLUBILITY  (WATER)                                       :             120 GMS PER LITRE

FASTNESS PROPERTIES                                

LIGHT                                                                        :            GOOD 

HEAT                                                                          :            GOOD (UP TO 1050 C)

                                                                                                   FAIR (UP TO 205 0C)

FRUIT ACIDS                                                           :             GOOD (BECOMES BLUER)

BENZOIC ACID                                                       :            GOOD

SULPHUR DIOXIDE                                               :             POOR

ALKALIES                                                                :            FAIR (BECOMES DULLER)