FD & C Red No.3 - WS - CI.45430 - CAS # 16423-68-0

CI Food Red 14, FD&C Red No. 3; C.I. (1975) No. 45430 INS No. 127

Consists essentially of disodium salt of 9-(o-carboxyphenyl)-6-hydroxy-2,4,5,7-tetraiodo-3-isoxanthone monohydrate and subsidiary colouring matters together with water, sodium chloride and/or sodium sulfate as the principal uncoloured components.

May be converted to the corresponding aluminium lake in which case only the

Chemical names

Disodium salt of 9-(o-carboxyphenyl)-6-hydroxy-2,4,5,7-tetraiodo-3-isoxanthone monohydrate

C.A.S. number

16423-68-0

Chemical formula

C_{20H6I4Na2O5 · H2O}

Structural formula

Formula weight

897.88

Assay

Not less than 87% total colouring matters

Red powder or granules

Colour

IDENTIFICATION

Soluble in water and in ethanol

Passes test