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#11
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Very Old Latent Image
In article ,
Geoffrey S. Mendelson wrote: The development process for the Ektachrome films was more of a simplification than a major change in chemistry. What used to be develop, stop bath, rinse, expose to light, color develop, stop bath, bleach, fix and stabilize has be reduced to three steps that do basicly the same things, using mostly the same chemicals. E6 is a 6-step process. There are 3-step processes that will give you a color image from films intended for process E6, but they will not give you a very _good_ color image! The biggest change in chemicals was in E4 going to E6 and c22 going to c41 with the elimination of formalin as a stabilizing agent. That was done for environmental and personal saftey, the other changes were to increase automation and decrease processing time. Actually, the removal of formaldehyde from E6 and C41 was a very, very late change. It required the reformulation of dyes in some C41 films, which was probably pretty painful for Kodak to do. You can still get the older type of stabilizer because there are still films which require it; these process changes were made only about five years ago. -- Thor Lancelot Simon "Even experienced UNIX users occasionally enter rm *.* at the UNIX prompt only to realize too late that they have removed the wrong segment of the directory structure." - Microsoft WSS whitepaper |
#12
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Very Old Latent Image
On Wed, 10 Dec 2008 22:37:44 UTC, VOR-DME wrote:
Thanks to all for taking the time to provide these informative responses. Greg Miller's service looks like a good bet to me - I have looked it up and the prices are more than reasonable as well. I'll get back to you all here to let you know how it worked out. _____ About 5 months ago i found some Tri-X 120 and 220 rols i had exposed in 1993. I made up a fresh batch of D76, and processed the rolls using a 15% increased development time to improve contrast. Yes, there was more base fog, but the negatives were quite printable. / J --- |
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