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PAS staining is mainly used for staining structures containing a high proportion of carbohydrate macromolecules (glycogen, glycoprotein, proteoglycans), typically found in e.g. connective tissues, mucus, the glycocalyx, and basal laminae.hese aldehydes then react with the Schiff reagent to give a purple-magenta color. A suitable basic stain is often used as a counterstain. PAS diastase stain (PAS-D) is PAS stain used in combination with diastase, an enzyme that breaks down glycogen.
When staining a deck, you have several choices in the type of stain to use. There are transparent stain types, semitransparent stain types, semisolid stain types and solid stains. Transparent stains will soak into the deck boards while a solid stain is more like a paint and will rest on top of the boards. The type of stain you use, as well as other factors, will greatly determine how often you need to stain your deck. As a general rule of thumb, the newer the deck, the more transparent the stain.