John Banister wrote:
After first development and bleaching, then I can chose to either fog the film and redevelop
or to proceed directly to sulfide or selenium toning, and these operations can be done in the
same manner for all films because they are carried out to completion. Is this approximately
It is correct for sulfide/thiourea, but not for selenium, as far as I know. I'm not sure what reaction, if any, occurs between selenium toner and silver halide. In any case, commercial selenium toners like KRST contain fixer-like ingredients which will degrade your positive silver halide image as you try to "tone" it.
If you use light-fogging followed by re-development, you can selenium-tone your film after fixing to "deepen" the image tone. I've read speculation that a toning step like this is part of the Scala process.
Jordan Wosnick jwosnick@xxxxxxxxxxx
Varigam Toner T-1 Water 500.0 ml Thiocarbamide 3.0 grams Sodium Hydroxide 6.0 grams Water to make 1.0 liter
--- Richard Knoppow Los Angeles, CA, USA dickburk@xxxxxxxxxxxxx
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