[pure-silver] Re: DELTA 100 AS REPLACEMENT FOR Tmax 100
- From: "Don Feinberg" <ducque@xxxxxxxxxxxxxx>
- To: <pure-silver@xxxxxxxxxxxxx>
- Date: Wed, 9 May 2007 11:28:44 -0500
> "If it works the effect is to lower the contrast of the highlights.
> Actually, the stain _is_ linear in that it is exactly
> proportional to the silver density, however, its effect on
> the paper depends on the stain density so its effect is
> greater for highlight than for shadow areas."
>
> .....its effect on the paper depends on the stain density so
> its effect is greater for highlight than for shadow areas.....
>
> Yes its effect is linear on the film, but is its effect on
> the paper linear?
Catechol stain is linear on paper because it is "brown" and is "seen" by the
paper as ND --- even on VC papers.
This is not the same as pyrogallol; pyro's stain is green/yellow which
affects local contrast on VC papers.
There's no "non linear" effect on graded papers.
- Don Feinberg
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