potassium bicarbonate?...can u check is it the only ingredient inside? then i can ask my former colleague to check the price from lab supplies company how much is this
potassium bicarbonate is very very stable, and it is indeed, not toxic or harmful to anyone, just a bit alkaline, that means, u find it a bit 滑 sand sand feeling for that solution, but if u dilute it to 1:1000, it wont hurt your skin.