Hacker News Reader

APh9 -a great class. Of course you can still buy HF chrome cleaner in a spray bottle! https://hpd.nlm.nih.gov/cgi-bin/household/brands?tbl=brands&...

It doesn't look as strong as the 2% solution PepBoys used to sell, though.

View on HN

Looks like they still have it! http://nanofab.caltech.edu/classes/aph9.html I'd forgotten the course name.

I think some rust removers also contain HF.

Yep, Whink brand rust remover is 4% HF. It's a somewhat useful source of hydrofluoric acid in a pinch. I recall a procedure for making uranium tetrafluoride from uranium trioxide (which in turn was extracted from uranium ore) using that brand of rust remover as the acidic fluoride source.

Reply on news.ycombinator.com