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3D3DSelenium toner.
Back in the dark ages photography involved soaking paper in a series of strange chemicals to make images appear on it. This 22g/l solution of sodium selenide was apparently one of them.
Source: eBay seller 20fec
Contributor: Theodore Gray
Acquired: 24 March, 2009
Text Updated: 24 March, 2009
Price: $15
Size: 10"
Purity: 1%