[pure-silver] Re: Iodide in emulsions...

  • From: "Ralph W. Lambrecht" <info@xxxxxxxxxxxxxxxx>
  • To: pure-silver@xxxxxxxxxxxxx
  • Date: Sat, 28 Nov 2009 13:42:18 +0100

From my 10-year-old conversations with Ilford, modern VC papers have three emulsion, which are of different contrast and different threshold sensitivities. In addition, they react quite differently to blue or green light. See attached images.











Regards




Ralph W. Lambrecht


http://www.darkroomagic.com



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On Nov 28, 2009, at 05:57, Richard Knoppow wrote:

My understanding is that the emulsions of variable contrast paper are all the same contrast but have different threshold sensitivities. I have yet to find a really clear explanation. Some early VC papers seem to have been combinations of a high and a low contast emulsion.

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