# KOH – potassium hydroxide crystals put out a lot of hydrogen gas, but also put out
hydrodge sulfide, which is highly toxic, something like nerve gas. Most of the law suits coming out of HHO production are because of this toxic gas. Potassium Hydroxide in powder form emits the same toxic gas, plus it can burn the skin.
# Sodium Hydroxide powder is not as bad as potassium hydroxide. It produces a lot of gas, but also produces
hydrogen sulfide gas, and if you get Sodium Hydroxide powder on your skin, it will burn. Also, aluminum is highly reactive with it. Sodium Hydroxide will quickly dissolve aluminum.