Cashew gum is a complex polysaccharides of high molecular mass, on hydrolysis it yields galactose and galacturonic acid. The variation in acid number is influenced not only by the source of the sample but also by its age. The sticky exudates from this tree darkens and thickens rapidly on exposure to air. When applied as a vanish, provides remarkable protection, as is unchanged by acids, alkalis, alcohols or heat up to 70oC.