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

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
  ----- Original Message ----- 
  From: john stockdale 
  To: pure-silver@xxxxxxxxxxxxx 
  Sent: Sunday, April 22, 2007 9:46 AM
  Subject: [pure-silver] Re: Paperdeveloper for roller transport machine


  It seems well accepted that some developer and fixer soak into the edges of 
the RC paper where it has been cut (how far I don't know).    I wonder if even 
prolonged washing would remove it.  It might be that more water immersion would 
send the chemicals further into the paper.  Perhaps all RC prints should be 
trimmed after drying.

  At 11:38 PM  22/04/2007, you wrote:

    > Well, actually the paper in a RC print does not absorb any chemical 
because of the plastic layers that protect it, only the emulsion layer does. 

    I take you think that no chemicals are absorbed into the edges of the paper 
where it has been cut.
  
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