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Laforet
on Dec 5, 2015
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Things I Won’t Touch: Hydrofluoric Acid (2004)
Apparently it was commonly used in home plumbing as well, argh.
https://news.ycombinator.com/item?id=10357115
CamperBob2
on Dec 5, 2015
[–]
Interesting thread on Reddit along these lines, as well:
https://www.reddit.com/r/whatisthisthing/comments/3vfam4/upd...
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https://news.ycombinator.com/item?id=10357115