Borax

Colorless translucent crystal or white crystalline powder. Odorless, salty. Slightly soluble in cold water, easily soluble in hot water and glycerin; slightly soluble in ethanol and carbon tetrachloride.

The borax solution is used as a plant fertilizer. The leftovers of borax production (magnesium hydroxide and borax mother liquor) can be reacted with sulfuric acid to obtain a mixture of boric acid and magnesium sulfate, that is, boron magnesium fertilizer. Borax is a kind of weed control in non-cultivated land and industrial areas. It has strong phytotoxicity. It has been used as a preservative and fungicide to prevent mildew in oranges.