The Periodic Acid Schiff (PAS) Stain Kit is used for the demonstration of neutral mucins, glycogen and some early lipofuchsins.
The technique is based upon the reactivity of free aldehyde groups within carbohydrates whereby the schiff reagent forms a bright red magenta end product.
Nuclei - Blue/Black
Glycogen - Magenta
Neutral/sialomucins - Magenta
Various Glycoproteins, early lipofuchsins - Magenta