Syonyms Name: C.I. Pigment Red 57, calcium salt (1:1); C.I. Pigment Red 57, calcium salt; C.I. Pigment Red 57:1; D & C Red no. 7; Lithol rubin BCA; Pigment Red 57.1 (C.I. 1580:1); 3-Hydroxy-4-[(4-methyl-2-sulfophenyl)azo]-2-naphthalenecarboxylic acid calcium salt (1:1)