[pure-silver] Re: Paperdeveloper for roller transport machine...contamination
- From: Claudio Bonavolta <claudio@xxxxxxxxxxxx>
- To: pure-silver@xxxxxxxxxxxxx
- Date: Sun, 22 Apr 2007 16:42:28 +0200
----- Message d'origine -----
De: "Dave Valvo" <dvalvo@xxxxxxxxxxxxxxxx>
Date: Sun, 22 Apr 2007 10:17:12 -0400
Sujet: [pure-silver] Re: Paperdeveloper for roller transport
machine...contamination
À: <pure-silver@xxxxxxxxxxxxx>
>I just looked at this thread. RC paper does soak in chemicals from the edges.
> It is called "edge penetration". Some papers are worse than others
>depending on the paper design. The deeper the processor, the greater the
>pressure is from the chemicals and the greater the edge penetration. Then the
>squeezing of the rollers acts as a pump when pressure is released. RC papers
>if incubated will show yellow edges that rarely go beyond 1/4 inch. SO if you
>are concerned about edge penetration cut a quarter inch off the sides. BTW,
>Kodak had technology that prevented this from happening.
>
>You can NOT wash the paper to remove this.
>
>Dave
Dear Dave,
Do you know what's the impact of the residual fixer in the paper layer of an RC
print ?
Say, you overfix a RC print for an hour and then wash it carefully to be sure
the emulsion has a low level of fix in it.
Will have the fix in the paper the possibility to impact the emulsion layer
through the plastic layer in-between or by other ways ?
Thanks,
Claudio Bonavolta
http://www.bonavolta.ch
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