Syonyms Name: D.C. Red No. 9; Lake Red C; Pigment Red 53-1; Red Lake C; 2-Chloro-5-((2-hydroxy-1-naphthyl)azo)toluene-4-sulphonic acid; sodium 5-chloro-4-methyl-2-[2-(2-oxonaphthalen-1(2H)-ylidene)hydrazino]benzenesulfonate; 5-chloro-4-methyl-2-[2-(2-oxonaphthalen-1(2H