Strong water soluble white crystalline oxidizer (O @ 56.09%) used in hundreds of applications including but not limited to; safer alternative to zinc chloride solutions for soldering flux, copper and zinc etchant (dissolve 1 kg in 4 liters water and store in a ventilated glass or plastic container); electroplating; bleaching applications; photography; manufacture of aniline dyes and dying; experimental oxidizer in pyrotechnics and explosives, etc.. No ATFE required to purchase - no quantity restrictions.