The kit supplies reagents for P.A.S (Periodic Acid Schiff) staining. Schiff Reagent is a watery, colorless solution, used in combination with periodic acid to visualize aldehyde groups. The P.A.S. stain is mainly used to visualize the presence of glycogen, many tissue may results P.A.S. positive, for example: the ground substance of connective, cartilage, bones, cells and glands, kidney structures, hypophysis basophil cells, thyroid colloid substance.