Re: GUM PRINTING QUESTION

Chris,
Well, I guess I'm confused, because I thought that in the issue of sun
bleaching dichromate stain, you were talking about a brown (reduced)
dichromate stain, not a yellow (unreduced) dichromate stain.
Katharine

>
> > It's an empirical question of course, whether the yellow dichromate
> > stain would turn brown over time, and could be tested by someone who's
> > interested, by putting one of these yellow dichromate-stained prints in
> > the sun and seeing what happens. If it stays yellow, that would be
> > somewhat astonishing but a good thing to know.
>
> I did this last summer and we had a discussion on this then; yes, the sun,
> in fact, does bleach the yellow dichromate out of the print.

If you mean here that

 All one has to
> do is put the print outside, cover half, and see the tone change. Better
> yet, expose and develop a print with just gum and dichromate, and put it
> outside and watch it disappear to a pale green.
>
> It was one method used in the old books (well lo and behold) to "clear" a
> print of yellow dichromate stain. Didn't I just share that piece of
> information here this month??
>
> It also convinced me that once the print is exposed and developed in water,
> what remains does not in fact turn dark or ruin a print. In fact, again, in
> old literature, clearing was always optional. I no longer clear. With my
> lower dichromate amount that I use (3/4 less am di than I used to) I no
> longer need to.
>
> There is nothing new under the sun it seems...literally and figuratively.
> Regards,
> Chris
Received on Wed Aug 10 12:26:47 2005