[pure-silver] Re: Pre or Post print flash exposure?

Chris

See 'The Theory of the Photographic Process', 3rd edition, page 142-143,
'Pre-Exposure or PostExposure'.

According to tests by Webb and Evans, a High Intensity exposure followed by
a Low Intensity exposure created significantly more density than the other
way around. The difference increases with an increasing low/high density
ratio. However, they note that these effects are most effective in emulsions
exhibiting reciprocity failure.

Nevertheless, I believe their test were done on film and not on paper.





Regards



Ralph W. Lambrecht

http://www.darkroomagic.com







On 2005-11-26 19:11, "Christopher Woodhouse" <chris.woodhouse@xxxxxxxxxxxx>
wrote:

> I have heard opinions expressed that pre and post flash exposures have
> different effects on a print's appearance, possibly with brief high
> intensity exposures or long low intensity exposures.
> 
> Have any of the group seen any references to this or seen differences in
> their own experience?


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