[Leica] Toning vs. paper and print color.

[benedenia at gmail.com (Marty Deveney)]

> The trick I learned is to add Selenium to the Hypo Clearing agent, two
> steps in one...

If your main aim is improving permanence, this works well, but where
the colour of the tone, its distribution and consistency of tone
between prints is really critical, it has shortcomings.  The colour
and distribution of tone is different to plain toning and it changes
more from print to print if you add the selenium toner to the Hypo
Clear, because the pH of the Hypo Clear is different to that of a
working solution of KRST, and the bath changes more than if you add
completely washed prints to a KRST bath.

There is ammonium thiosulfate in KRST and it always seemed odd to me
to add hypo to hypo clear - a bit like adding paint to paint stripper.

Marty