0.5% Periodic Acid is a component for the following MasterTech Stain Kits: P.A.S. Stain Kit, Alcian Blue-P.A.S. Stain Kit, and Jone's Basement Membrane Reticulum Stain Kit. Running out of a component in your MasterTech Stain Kit? Replace your used or expiring item by purchasing an individual solution. Components are available in larger sizes to fit your rate of usage.