RE: dichromate stain

I do usually develop over an hour or so, two 5-min baths, then 10, then
30 in running water. I have noticed however that in the first two baths
sometimes the dichromate migrates to the upward (back side) of the
paper....and turning it over in subsequent baths removes most of the
stain. Maybe it's the water TEMPERATURE????????
I will try this out.
Cheers
Kate

Kate Mahoney Photography

-----Original Message-----
From: Judy Seigel [mailto:jseigel@panix.com]
Sent: Monday, 14 June 2004 5:57 p.m.
To: alt-photo-process-l@sask.usask.ca
Subject: dichromate stain

On Sun, 13 Jun 2004, Kate Mahoney wrote:

> Do you really think it's your light? I used to use sunlight, found the
> stain less than with the mercury vapour lamp I'm using now - but I may
> have it too close to the work.
> Could it be your washing water or method???? I'm curious - I always
get
> a little stain and I hadn't realised how pervasive it was when I was
in
> the early experimental stage - until I finally cleared some prints
> properly. Then I was amazed!!!!

I've used 3 lights -- BL, Daylight fluorescent, and NuArc halide and
never
noticed a difference in dichromate stain. I have noticed more staining
when the paper had been coated for a longer period before exposure
especially in hot weather,, and/or kept a longer period after exposure.

Another reason I have less staining is probably that my development
times
tend to be long. I gather that some folks develop a half hour or less...
I
usually develop an hour and up... and I have noticed that the really
long
soaks come out wonderfully white -- and assume that, at least in part,
that is why I rarely if ever need a clearing bath.

However, I have a hunch that the wash water is also a factor if not THE
factor. I've heard of printers who did everything identically & one had
dichromate staining, the other not. The only difference was geographic.
I once brought a liter of water home from Washington State to test
that...
but a liter wasn't enough --the test got screwed up somewhow, but from
the
little I did see that was a real possibility.

J.

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