Re: colored ions

permanganate is beautiful but it will react with paper and lots of
other media.

Be careful around Cr(VI) because it is a known human carcinogen.
(Ingestion route). Phosphomolybdate and phosphotungstate are beautifly
yellow and turns blue on electrochemical reduction.

Ferricyanide is deep-yellow (and toxic) the trouble is that its salts
are often very poorly soluble.

.

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