[pure-silver] Re: when lights?
----- Original Message ----- From: "BOB KISS" <bobkiss@xxxxxxxxxxxxx> 
To: <pure-silver@xxxxxxxxxxxxx>
Sent: Thursday, July 24, 2008 9:21 AM
Subject: [pure-silver] when lights?



DEAR LIST,
Regarding processing B&W VC FB paper, I am very interested to hear at what point in the (normal, not rapid) fixer you turn on the white lights. Let's assume you develop and stop in your normal way and are using regular fixer. I use the two fixer method; 5 min in the first fix and 5 more min in a very fresh second fix. But most of this is irrelevant to my 
question:
How long after you put your print in the first fixer do you feel it is safe to turn on the white lights? Do you wait the full 5 mins or do 
you feel it is safe earlier?

                       CHEERS!

                                   BOB
Kodak always recommends half way through the fixing process. If you are using a two bath system this means until you transfer the prints to the second bath. I think this is overkill, the emulsion will have been desensitized within a few seconds in the fixing bath but there remains a slight danger of some photolytic silver being generated by the light. This is the same reason that Kodak recommends carrying out the bleaching of prints for sepia toning under a white light. The chances of this in either process is almost nil if the room light is dim. Photolytic silver is silver generated directly by the action of light on silver halide. It is the kind of silver produced in silver halide printing out paper and is one cause of partial reversal although the usual "solarization" effect depends on some active developer being in the emulsion. To be on the safe side I would wait until the half way fixing point except for prints you know are throw-aways. 

---
Richard Knoppow
Los Angeles, CA, USA
dickburk@xxxxxxxxxxxxx 
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