Re: Van Dyke Help Sought
Michael R. Coble (groundglass@delphi.com)
Thu, 12 Sep 1996 20:41:33 -0400
>I've run across a little problem with my Van Dyke prints, and was
>wondering if anyone would have an idea.
>
>I've made quite a few successful prints, but the last few have given me
>problems, which can be seen as "off color" (mostly darker) spots on the
>paper. At first I thought that the problem was due to using a less
>expensive paper, but switched to Arches with the same problem. I also
>though that the problem might be due to double-coating, but it has also
>happened when single-coating the paper.
>
>Anyone seen this?
>
>Thanks -
>
>george
>
>--
> Handmade Photographic Images
> http://www2.ari.net/glsmyth
>
>
>Yes I've seen this and I think the problem may be in the emulsion. The
question is do you filter your solution? I've found that by filtering the
solution through filter paper(or coffee filter if around) the spots are
elliminated.I believe it has to do with the silver nitrate reacting to
organic materials in the emulsion.(Of course I could be wrong).You might
also try a consistent Sizing technique if you size your paper.
Good Luck,
Michael Coble
Groundglass Camera Repair
groundglass@delphi.com