[pure-silver] Re: Can Someone Refresh My Memory Please?
- From: "Gregory Popovitch" <greg@xxxxxxx>
- To: <pure-silver@xxxxxxxxxxxxx>
- Date: Thu, 7 Apr 2011 10:01:08 -0400
> Rate* of exhaustion is higher near either the highlights or shadows, but I
cannot recall which
Rare of exhaustion is higher near the shadows (for paper). The developer
doesn't get exhausted near the highlights because it doesn't have anything
to do.
The developer works by reducing the silver halides (that have been exposed
to light) to elemental silver. If you put a piece of unexposed paper in the
developer, no chemical reaction takes place, the developer doesn't change or
get exhausted at all. Exhaustion only happens when the reducing reaction
takes place.
So the developer will get exhausted (when it is dilute enough and there is
no agitation) near the dark areas of either film or paper, so it will the
reduce the development of highlights for film, or shadows on paper.
greg
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