Re: Another Ziatype question

From: Loris Medici ^lt;[email protected]>
Date: 10/11/04-12:41:29 PM Z
Message-id: <003601c4afc1$ec925b20$bd02500a@Loris>

Re: Another Ziatype questionSandy, thank you very much for the contribution.

Ok, will definitely develop ("wash" I mean - no development with Ziatype) in
2% citric acid next time!


----- Original Message -----
From: Sandy King
Sent: Monday, October 11, 2004 8:50 PM
Subject: Re: Another Ziatype question

Have you checked the pH of your developer? Staining that can not be cleared
results from the formation of iron hydroxide from residual ferrous iron,
Fe(2+) in an alkaline environment. In kallitype printing staining can take
place during both development, if the developer is alkaline, or during
washing, if the tap water is too alkaline. The iron content of the tap
water, in combination with a high pH, may also play a role. I suspect that
the same goes for Pt./Pd. printing since residual ferrous iron is a
reduction by--product.
Received on Mon Oct 11 12:34:45 2004

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