Alcian blue or alcian blue (/ˈælʃən/) is any member of a family of polyvalent basic dyes, of which the Alcian blue 8G (also called Ingrain blue 1, and C.I. 74240, formerly called Alcian blue 8GX from the name of a batch of an ICI product) has been historically the most common and the most reliable member.
A 1605 (OTTO) Alcian Blue 8GX Cas 33864-99-2 - used as a heteroglycan stain for neutral, sulfated and phosphated mucopolysaccharides and glycosaminoglycans in tissues such as cartilage and extracellular matrices.