Tin(II) chloride dihydrate is widely used as a reducing agent (in acid solution), and in electrolytic baths for tin-plating. Tin(II) chloride dihydrate is used in the Stephen reduction, whereby a nitrile is reduced, via an imidoyl chloride salt, to an imine which is easily hydrolysed to an aldehyde. Tin(II) chloride is used as a mordant in textile dyeing because it gives brighter colours with some dyes. It is used as a catalyst in the production of the plastic polylactic acid (PLA). It also finds a use as a catalyst between acetone and hydrogen peroxide to form the tetrameric form of acetone peroxide.