Archived posting to the Leica Users Group, 2002/03/25
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]At 3/25/2002 07:48 AM -0800, Frank Filippone wrote, in part: >Bottom line, in understanding the chemistry of the stop bath..... >Developers work in alkaline environments. The purpose of the stop is to >make the environment acidic, such that the developer action is immediately >stopped. This gives you a consistent process. I recall reading, many years ago and probably in a Kodak publication, that another purpose of the acid stop bath was to put the film into an acid state which would extend the life of the (typically) acid fixing bath. I always thought this sounded logical, but not being a chemist of any sort have no way of knowing if it makes any practical sense. And now that I frequently use a supposedly alkaline fixing bath (from Photographer's Formulary) I'm not sure what relevance it has for me. I used an acid stop bath for many years, but in the past few have been using just water, and I don't think I see any difference in results on film. Cheers, Kip - -- To unsubscribe, see http://mejac.palo-alto.ca.us/leica-users/unsub.html