Borax Decahydrate is the refined form of natural sodium borate.
 
Composed of boric oxide (B2O3), sodium oxide, and water, it is a mild, alkaline salt, white and crystalline, with excellent buffering and fluxing properties. 
 
Can be used as a fertiliser, herbicide, ant killer and disinfectant.
 
Warning: Use protective equipment with handling. Always read and strictly follow product label and safety directions carefully to ensure the product is handled correctly.