Well, I hope to only have to deal with this film over the next four rolls and the customer will heed my advice and use films that produces excellent results, and has been around for years. Processes in any number of chemicals that have great shelf life and process dozens of rolls not a small handful. You can insert about 8 film types into that description before you go off playing with experimental films. I thought it might be a memory issue, that this stuff just had been sitting around for a while or didn't have a proper R&D. It was a royal pain to make contacts. Eric Neilsen Eric Neilsen Photography 4101 Commerce Street, Suite 9 Dallas, TX 75226 www.ericneilsenphotography.com skype me with ejprinter www.ericneilsenphotography.com/forum1 Let's Talk Photography -----Original Message----- From: pure-silver-bounce@xxxxxxxxxxxxx [mailto:pure-silver-bounce@xxxxxxxxxxxxx] On Behalf Of Richard Knoppow Sent: Monday, June 14, 2010 8:43 PM To: pure-silver@xxxxxxxxxxxxx Subject: [pure-silver] Re: Data - RE: Re: Anybody use Rollie ATP and process with their recommended developer? ----- Original Message ----- From: "Eric Neilsen" <ej@xxxxxxxxxxxxxxxxxxxxxxxxxx> To: <pure-silver@xxxxxxxxxxxxx> Sent: Monday, June 14, 2010 2:06 PM Subject: [pure-silver] Data - RE: Re: Anybody use Rollie ATP and process with their recommended developer? > Well, The film was hanging in the film drying box when I > got in this > morning. It has a substantial bluish color in the B&F > area. Processed it at > 68F for 7 min. It appears to be a little bit much for the > 1:14 development. > I might need to trim that back to 5. The biggest issue was > the curl of the > film; Took it off the clips and it rolled right up the > long way. > > > > Eric Neilsen > 4101 Commerce Street, Suite 9 > Dallas, TX 75226 > 214-827-8301 I wonder if there is no anti-curl back coating or if the support has some strange sort of memory. Most of the time curling of film or paper is due to the differential shrinkage of the emulsion vs: support. Film has had a back coating of gelatin as an anti-curl device for a century now. It also often has the anti-halation dye in it. The dye is changed to a colorless form by the sulfite in developer and fixer but neither the gelatin or dye is removed. One reason for excessive shrinkage of the emulsion is lack of hardening in manufacture. Gelatin is much like a sponge in that it swells and contracts with moisture content and pH. The "hardness" of gelatin is not quite the same thing is physical hardness but rather a measure of the amount of swelling with temperature and moisture content. Soft gelatin changes a lot. Many modern B&W films are hardened in manufacture so that they will withstand processing temperatures of 100F, similar to color films, however, many older emulsions are not and I suspect film made by some of the smaller companies have pretty soft emulsions. I am not quite sure what to do about this but changing the nature of the fixing bath may help, that is, if you currently use a non-hardening bath switch to one with a hardener, or use one without hardener if you do use one. Another possibility is to adjust the pH after fixing. If you don't use a sulfite wash aid try one. Even if you are using an alkaline fixing bath a buffered sulfite wash aid like Kodak Hypo Clearing Agent will adjust the pH to neutral and might make a difference. -- Richard Knoppow Los Angeles, CA, USA dickburk@xxxxxxxxxxxxx ============================================================================ ================================= 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. ============================================================================================================= 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.