Katharine Thayer wrote:
>
This yellow stain, after being
> developed half an hour and dried, did turn brown when placed outdoors
> half covered;
I should say, to be clear, that this was exposed the usual way before
developing, although I do strongly suspect that this yellow stain works
the same way that pigment stain works: it's a function of the encounter
between the coating and the sizing/paper and if it's going to happen, it
will happen whether the coating is exposed or not. Some sizing/paper
combinations, under certain moisture conditions (this is my experience
and tentative hypothesis at the moment anyway) will grab the yellow
dichromate when coated and won't let go of it in the water bath, thus:
yellow stain. This yellow stain, like the usual tan/brown dichromate
stain, can be removed with the usual clearing bath, but it shouldn't be
assumed that it is as stable as the usual post-exposure dichromate
stain, as I have just demonstrated.
Katharine
Received on Thu Aug 11 09:51:42 2005
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