Re: Paper negatives
On Oct 11, 2008, at 9:06 PM, Katharine Thayer wrote:
It could be dichromate stain, or it could be a light pigment stain,
depending on the pigment, or a combination. The easy way to tell
is to soak it briefly in 5% potassium metabisulfte or sodium
bisulfite (followed by rinsing in water) if it's dichromate stain
it will come right out.
Quick clarification: What I meant here is that a warm black, like
ivory black, can leave a warm stain like that in the highlights that
can be indistinguishable from dichromate stain, so the only way to
tell which it is, is to treat it with a clearing agent.