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Message:: [QUOTE="-jeffB, post: 5245305, member: 27832"]From a chemistry hobbyist who's worked with these acids, and had a fair number of mishaps, and tends to be clumsy: These acids are very powerful and dangerous, but you're going to be using very small quantities. If you get the acid on your skin, it will leave a burn. Flush with cold water for a long time -- standard advice is multiple minutes, but I was never that patient. You'll likely get a yellow spot, or a black spot if the acid's already dissolved some silver, and it will turn into a blister. But if you're only using a drop or two at a time (as you're supposed to), it'll be a very small one. If you get it in your eyes, standard advice is to flush with running water for 30 minutes, while you contemplate your life choices. You'll be spending lots of quality time with doctors. Fumes from these acids are very bad for you, but again, working with a drop at a time the hazard is minimal. Leaving the bottles open is bad, as [USER=111545]@CommemHalfScrub[/USER] said -- bad for you, bad for any metal or paper that's around the vapors, and bad for the acids, which will lose their potency more quickly. Seal the cap tightly after each use. To dispose of residues, flush off the stone with plenty of water. It's fine to let it run down the sink; it'll be far too dilute to cause any harm. I'll defer to [USER=111545]@CommemHalfScrub[/USER] on cleaning procedures for the stone, as I've only used mine a few times.[/QUOTE]