Information: The Alcian Blue (pH 2.5) Stain Kit is intended for use in the histological visualization of sulfated and carboxylated acid mucopolysaccharides and sulfated and carboxylated sialomucins (glycoproteins). Acidic Sulfated Mucosubstances: Blue Hyaluronic Acid: Blue Sialomucins: Blue Nuclei: Red Background: Pink