PAS : Periodic Acid-Schiff (PAS) stain This is used to stain polysaccharides such as glycogen, mucosubstances like glycoproteins, glycolipids, and mucins in tissues.Here are a few examples of conditions where this stain is utilized: Candida: The budding cells and pseudohyphae stains red / purple.  Acute Lymphoblastic Leukemia (ALL): PAS-positive blasts. Multiple Myeloma: PAS-positive cytoplasmic inclusions.... Continue Reading →