This painless condition occurs when the little bumps on your tongue grow long and trap bacteria that live in your mouth -- making the tongue look black and hairy. Causes can include antibiotic use, poor oral hygiene, smoking, drinking a lot of tea or coffee, and not producing enough saliva.
Hello, Jie. The word passivate is a bit troublesome because aluminum cannot be passivated in the same sense as stainless steel; but it can be passivated in the same sense as zinc plating, i.e., with a chromate conversion coating.
These 10 facts about space will blow your mind. Activated alumina is a form of aluminum oxide that is very porous and bonds with certain liquids and gases without its chemical or physical form changing.Due to its high porosity, it has a high ratio of surface area to weight.ctivated alumina is a common desiccant that may be used to protect items that are moisture sensitive during shipping.