[pure-silver] Re: Paperdeveloper for roller transport machine...contamination

The advantage of RC is to keep the fibers from getting wet. If all you have is emulsion to develop, fix and wash you can do this in less than a minute. Longer process times are recommended for tray use because the developer temperature is lower. In machines at 100F you can develop completely in 15 seconds.
Use this as a guide....The longer you leave an RC print in the chemicals the worse it is. The main issue is edge penetration.
DO NOT USE HYPO CLEAR ON RC PRINTS! a little residual fix is a good thing for stability. 

Dave
----- Original Message ----- From: "Claudio Bonavolta" <claudio@xxxxxxxxxxxx> 
To: <pure-silver@xxxxxxxxxxxxx>
Sent: Sunday, April 22, 2007 10:42 AM
Subject: [pure-silver] Re: Paperdeveloper for roller transport machine...contamination 



----- 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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