[rollei_list] Re: Rollie R3 film
----- Original Message ----- From: "Laurence Cuffe" <cuffe@xxxxxxx> 
To: <rollei_list@xxxxxxxxxxxxx>
Sent: Monday, July 30, 2007 12:35 PM
Subject: [rollei_list] Re: Rollie R3 film



Dear All
I shot a roll of Rollei R3 film shortly after it came out. With one roll I tried using a piece of overexposed slide film inside the camera as an IR filter and the results were a failure. I dumped the film in a corner of the darkroom and didn't look at it till today. I picked it up for my daughter to use to practice loading 120 into a developing reel and discovered that the film is delaminating big time. Its separating into three layers, two thin outer layers one on each side, one of which seems to contain the image and a central more rigid transparent layer. Has any one else encountered this? One thing I should stress is that this was not by any manner of means normal film storage conditions. Humidity probably cycles 50-100% and there is probably a significant amount of airborne chemistry from time to time. 
Any thoughts welcome
Larry Cuffe
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Rollei List
I've never seen this happen without very high heat or chemical treatment. What you are seeing is the emulsion and the anti-curling gelatin layer on the back coming off the support. Films and plates usually have a substrate coated on the support to "glue" the gelatin layers on. Evidently, the technology available to the makers of this film is not very advanced or else the discarded film was subjected to some quite unusual conditions. I don't know for certain what is currently used for subbing but the old technology for safety base film was to use a very thin coating of Cellulose Nitrate under the emulsion and back-coating because gelatin does not stick to Cellulose Acetate very well. There are people doing alternative processes who would _love_ to know an easy way of stripping the emulsion from either film or paper without damaging it. One can get it off easily using very hot water but that begins to dissolve the coatings. Household bleach will strip everything off down to the support, not exactly useful if you want to preserve the image. 

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Richard Knoppow
Los Angeles, CA, USA
dickburk@xxxxxxxxxxxxx 
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Rollei List

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