Re: hp and pot di with pt/pd

From: Bill Marsh (redcloud54@earthlink.net)
Date: 04/09/03-11:52:00 AM Z

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Christina,

I use hydrogen peroxide as a contrast agent for pt/pd, added
to the sensitizer in place of solution 2. I have always had
a real problem with with graininess using solution 2, and
have found that h2o2 works very well.

Bill

Christina Z. Anderson wrote:
> Good morning!
> Does anyone use either hydrogen peroxide or potassium dichromate added
> to the developer or hp added to the sensitizer (the latter not for
> palladium)?
> Correct me if I am wrong here: added to the developer, dichromate will
> increase contrast? And hp will decrease contrast? Why does this happen?
> Chris
>
>
>

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