开云体育Mike, I bet your skin around the wound had some yellow stains.? When nitric acid reacts with soluble proteins it produces xanthoproteic acid, which is yellow in color.? ?I took my chemistry labs in the 1960s before safety became a big issue, but I knew enough to be very, very careful and used PPEs, the fume hoods, etc, but when I developed some yellow stains on my hands my professor spotted them and gave me some extra reading material.? ? And Bruce, thanks for the information on passivation.? I’ve seen the word associated with metals for years, but was always too lazy before now to look it up.? ? For everyone else, don’t forget that tomorrow is p day!? Yum. ? Jerry F. ? From: [email protected] [mailto:[email protected]] On Behalf Of Miket_NYC
Sent: Wednesday, March 13, 2024 5:29 PM To: [email protected] Subject: Re: [7x12MiniLathe] Using nitric acid to remove broken taps or drills from aluminum ? "As a trained chemist I’ve needed to use con Nitric a bunch of times. You do have to be careful not to spill it on you because it promptly kills the nerves in your skin so you don’t notice it dissolving you." ? I understand your concerns, but what I said in my original post was: "spilling a little on your hand, etc., is no problem if you PROMPTLY wash it off." How much more emphasis do?you think I should?add beyond that?? If you're paying attention, you'd?wash it off immediately. ? That's what I always do now, but decades ago, I spilled some?concentrated nitric on my hand in a college chemistry lab, and it was just as you say. I felt no pain and didn't notice anything for?30 seconds or so, until I saw smoke rising from my hand. I DEFINITELY wasn't paying enough attention then, and I wound up with what looked like bad?sunburn on my hand. But it went away in a week or two?and there was no permanent harm.?? ? I assume?anyone who uses this for dissolving broken drills and taps will use appropriate precautions. But you must know more about lab procedure than I do, so if you have more to add besides eye protection, paying attention, and having?running water handy, please tell us what it is. ? Mike Taglieri? ? On Wed, Mar 13, 2024, 2:17 PM Bruce J <bruce.desertrat@...> wrote:
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