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Posted in response to Re: WHAT'S REALGAR? from Lloyd Brown on October 12, 2007 at 22:56:09:

Re: Re: WHAT'S REALGAR?

Actually realgar breaks down (in response to visible light) into pararealgar, which is a poorly crystalline substance having the same coposition as realgar. It turns out (so I've read) that creating orpiment would be impossible from an energy standpoint in this breakdown. Curiously the part of the spectrum realgar reacts most strongly to is the red end of the visible spectrum. I find this fascinating considering realgar's strong red color. I wonder if any other light sensitive minerals have this color/spectrum relationship. It also odd to me that the wavelengths least absorbed by the crystal, thus giving it the red color, are the ones that are doing the most damage.

From Keith Wood - December 08, 2007 at 21:21:06

Message: 65658

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