On 08/02/2014 08:07 PM, Warp wrote:
> Salts come in all kinds of colors. Just look at the wikipedia page.
> The first example photograph shows a bright blue crystalline form,
> while the second is a bright red.
>
> http://en.wikipedia.org/wiki/Salt_%28chemistry%29

Yeah, but that's CuSO4 - and, like most copper compounds, it's an 
emetic. You don't wanna put that stuff on your chips. ;-)

More generally, the really pretty-coloured stuff is usually pretty due 
to the metal ions in it - and, in general, those kill people.

(The same goes for pottery glazes, actually. The most beautiful ones all 
contain lead. Which is great for glazing a sculpture, not so great for 
glazing a teapot...)

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