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This is a link post Freaky chemical stuff
Some more MP4 links here
pubs.acs.org/doi/10.1021/acs.langmuir.4c03160#_i15
 (I helped save b3ta! simbosan is too tired, Thu 6 Nov 2025, 13:41, Reply)
This is a normal post Interesting, I'll have to look that one up and try it.
My best guess is the common ion effect. Acidified with dilute HCl, the copper precipitates as CuO at the border between the two solutions, hence the darkening.
 (I helped save b3ta! FeralCatMan Unusual disease collector., Thu 6 Nov 2025, 13:58, Reply)
This is a normal post Christ, don't mention darkening at borders, you'll set everyone off

(The Porcupine From Purgatory we of all lost both have them, Thu 6 Nov 2025, 14:19, Reply)
This is a normal post Magical!
But I'm wondering where I put my science hammer...
 (I helped save b3ta! fred zeppelin II: Electric Boogaloo, Thu 6 Nov 2025, 17:03, Reply)