Archived posting to the Leica Users Group, 2002/04/02
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Hi Dennis: I believe you're right on the temp. Can't remember how he controlled that! The chap had a long wooden tank, subdivided into many compartments, made waterproof with fiberglass, like you'd put on a boat. As I recall, he developed the film first (similar to B&W developing) and then exposed it to light to do the reversal. Then the film ran through these tanks on a series of reels that were chain driven by a small motor. Timing differences in the dyes, bleaches etc. for the various layers were controlled by varying the size of the reel & compartment; and keeping the motor speed a constant. Caveat: I may have this process somewhat out of sequence - and somebody will correct me if I do - but it *was* a long time ago! Apparently the method is public knowledge, if you know where to look. It's the chemicals, in less than industrial lots, that's the trick! Too much effort for me, too! I'll simply keep the ol' R's loaded with C-41 and my sweetie will be happy. :) Best, David. - --- Dennis said: >I don't have a reference but know I once read the temp for Kodachrome was >plus/minus one quarter degree, F. > >The chemistry was probably the big problem. I know the original Kodachrome had a >lot of steps in processing. I believe there was a developer for each color >layer. Then, since the dyes were not in the emulsion they had to be "added" as >separate processing steps. > >Mmmm too much effort for me! - ---------- David Young | Experience gained varies directly Victoria, CANADA | with equipment ruined. - -- To unsubscribe, see http://mejac.palo-alto.ca.us/leica-users/unsub.html