Tablele alkali generally refers to sodium hydroxide (Sodium Hydroxide). It is also known as harsh sodium, alkali, and porridge. It is a kind of inorganic compound. Chemical NaOH, sodium hydroxide is strong alkaline, extremely corrosive, can be used as acid neutralizer, which can be used as a neutral agent agent. In conjunction with the mask, precipitant, sedimentary masking agent, toner, saponin, peeling agent, detergent, etc., the use is very wide.