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Preparation of Good Quality Scheele's Green From Arsenic Trioxide
In this video I demonstrate an old way of making Scheele's Green that yields a nice, consistent color. It's preparation is not the difficult nor is it all that dangerous so long as some common sense is used. Of course the compound itself toxic as hell as it contains cupric Cu(II) and hydrogen arsenite AsO3H-2 ions. It will dissolve in mineral acids back to free curpric ions and arsenous acid and not do much of anything else. You can clean your glassware this way (dispose of the waste water appropriately). However an active metal (anything that will dissolve in the acid to give off hydrogen gas) added to the mix may produce the heavier than air gas arsine which is a powerful blood poison (it attacks hemoglobin destroying its ability to carry oxygen). That particular combination should be avoided entirely.
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