From: Ed Buffaloe (EdBuffaloe@unblinkingeye.com)
Date: 02/05/02-05:23:21 PM Z
Sandy,
In my limited experience, adding 1 or 2 drops of 3% potassium
dichromate definitely gives more contrast, though I often have more problems
with defects in the emulsion--I'm still trying to figure out if I'm just
being sloppy in preparing the sensitizer, or if it is dicey no matter what
you do What kind of problems have you had? What concentration is your pot.
dichromate? One of the best prints I made came when I used 2 drops of 3%
pot. dichromate on the first coat, then dryed, then used straight sensitizer
for the second coat. There was some mention at APIS that sodium
hexachloroplatinate might help increase contrast for VDB, but I haven't had
a chance to pursue it yet.
Ed Buffaloe
http://unblinkingeye.com
----- Original Message -----
From: "Sandy King" <sanking@CLEMSON.EDU>
To: <alt-photo-process-l@sask.usask.ca>
Sent: Tuesday, February 05, 2002 10:16 AM
Subject: Another VanDyke question
> If someone knows of an effective way to control contrast with
> vandyke. My tests in adding potassium dichromate to the sensitizer
> before coating and/or to the developing water have all resulted in
> mixed results. Are there other options?
>
>
> Sandy King
>
>
>
>
>
> --
>
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