Potassium hydroxide (KOH) solution is a strong alkaline solution used as a reagent in chemical reactions, as a cleaning agent, and as an electrolyte in batteries. It is also used in the production of soaps and detergents., Potassium hydroxide solution is typically supplied in various concentrations, including 45% by weight. It should be handled with caution as it is corrosive and can cause burns. This is supplied by Sigma.