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Re: Eclair Cameras: film processing b&w reversal


Last I knew, a first developer was still used for B&W reversal. I don't think B&W has really changed in the last 50 years, except that the small home B&W Reversal Kits for still photography are now called "T-MAX REVERSAL DEVELOPING KIT" rather than the old name "DIRECT POSITIVE FILM DEVELOPING KIT." Certainly the B&W 16mm films have not been reformulated since the late 1950s, so what worked when I used to do my own processing in the 70s should still be valid today.

The 1st Developer is essentially D-19 with a pinch of Sodium Thiocyanate to help reduce grain size. With this additive, I think Kodak dubs it D-67. (this is from memory, so double check me). If you wanted slightly larger grain, you could try straight D-19.

And yes, there is probably no one left at Kodak that knows anything about B&
W. Sad but true. Kodak used to publish little bookets on B&W reversal processing for motion picture film, which they'd send out for free. It even contained the formulas for creating the baths from raw chemicals. Now perhaps Kodak has modified the process in some way; maybe to make it more environmentally friendly, but the old process as I recall:

(Prehardener recommened)
1st Developer D-67 (or straight D-19 might work fine for your taste)
Bleach R-9  (a mix of Potassium Dichromate and Sodium Bisulfate)
Clearing Bath (Sodium Sufite) ---- Don't leave film in this bath any longer than called for! It will eat silver.
EITHER:    a) Fogging Redeveloper   or:

               b) Reversal Exposure
                   Second Developer: D-19
Stop Bath (regular acetic acid stop bath)
Fix (standard B&W fixer is ok)
Hypo Clear for archival

The important thing is 100% consistency in processor speed, chemistry temperature, and mixing of chemicals. Reversal processing is not nearly as forgiving as negative. Hope this helps. Regards, Mark. PS - I hope you are using a continous processor and not one of those 100' processing tanks. I never had good results with those things, though some people have told me that they got perfectly ok film from them. GOOD LUCK.

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