----- 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 ============================================================================================================To unsubscribe from this list, go to www.freelists.org and logon to your account (the same e-mail address and password you set-up when you subscribed,) and unsubscribe from there.