The Colloidal Iron Stain Kit is designed for the histological visualization of acid mucopolysaccharides.Acid Mucopolysaccharides: Bright BlueCollagen: Shades of RedKit contents: AAK060, Acetic Acid Solution (12%), 60 ml (x2).DDH030, Water, Deionized/Distilled, 30 ml.HQA030, Hydrochloric Acid Solution (1N), 30 ml.PFD030, Potassium Ferrocyanide Solution (3%), 30 ml.CIS030, Colloidal Iron Stock Solution, 30 ml.VGS030, Van Gieson’s Solution, 30 ml.