Rose-β-D-Gal (6-Chloro-3-indoxyl-β-D-galactopyranoside) is a chromogenic substrate for β-galactosidase. The product is similar to X-gal, but generates an intense pink colored precipitate (λmax ~ 540 nm) on enzymatic hydrolysis. White solid soluble in DMSO Store at 4°C and protect from light C14H16ClNO6