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Forum: Film Processing, Scanning, and Darkroom
12-20-2018, 02:15 PM
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..and what little selenium that was in it has precipitated out leaving the toner utterly exhausted.
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Forum: Film Processing, Scanning, and Darkroom
12-18-2018, 02:06 PM
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Try leaving an exposed and developed square of photographic paper half submerged in it for several minutes, a dark piece of test strip will do - the effect of selenium toner will be distinctly visible after 5 mins.
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Forum: Film Processing, Scanning, and Darkroom
12-17-2018, 07:56 AM
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I read the MSDS sheet for this toner. It could be the solute sodium selenate decomposing and precipitating out of solution and forming elemental selenium around nucleation sites. Elemental Selenium is typically red, though black/grey allotropes do exist and commonly form in oxygenated environments. Cold temperatures and oxidation are likely culprits here. If you so desire, moderate heating with agitation should re-dissolve the precipitate.
The toner should be fine, as long as the precipitation is brought to a halt. If things remain on their current course, the reduction in selenium content in solution may lead to the toner becoming as effective as tap water.
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