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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.
Prepare wood for staining with the Minwax 1 qt. Pre-Stain Wood Conditioner. The conditioner penetrates the grain of new or bare softwood surfaces, such as pine, fir and spruce, or porous wood surfaces, including maple, alder and aspen. The conditioner prevents streaks and blotches to help ensure a beautiful, even stain.