Archived posting to the Leica Users Group, 2002/01/05
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]> Date: Sat, 05 Jan 2002 08:40:40 -0700 > From: John Collier <jbcollier@powersurfr.com> > Subject: [Leica] Xtol ramblings > Message-ID: <B85C6C88.17EC7%jbcollier@powersurfr.com> > References: > > The bit you quoted does not say that. It did say that if Xtol is stored for > longer than six months, there may be problems with diluted solutions of 1:2 > or 1:3. Whether this is actually a problem depends on your methods and > chemical consumption. > > John Collier Hi John, Kodak says it did more extensive testing of Xtol before introduction than any similar product in the company's history. This included, for the first time, testing in rotary processors and publishing the development times for those as well as for traditional developing methods. On that basis, when the company withdraws a recommendation I think it is reasonable to take a negative inference as I don't believe it is something they would do lightly. I don't think it is unreasonable to consider a withdrawn recommendation to be a defacto recommendation against the practice. If 1:3 dilution works for you, then fine. Indeed, Kodak has probably built in some safety margin to account for the differing quality of local water, etc. But I think it's silly to dismiss the manufacturers recommendations (or lack thereof) out of hand -- both with respect to the minimum stock needed per roll and with respect to maximum dilution. Rolfe Tessem rolfe@ldp.com >> From: Rolfe Tessem <rolfe@ldp.com> >> >> To me, it is clear that Kodak is now recommending against Xtol dilutions >> greater than 1:1 or, at a minimum, says you do so at your own risk. > > > >> ------------------------------------------------------------------- >> Note:Kodak has tested XTOL Developer for long-term keeping by using >> typical equipment and procedures. Results indicate that mixed XTOL >> Developer stored for one year at room temperature (70°F [21°C]) in a >> full tightly closed bottle provides satisfactory results with Kodak >> black-and-white films when used at full strength. Some customers, >> however, have reported problems with developer stored for periods >> between six months and one year. Most often the problems related to loss >> of developer activity when customers were using a 1:3 or 1:2 dilution of >> the developer to process KODAK T-MAX 100 Professional Film. >> To help ensure best results, we have changed our recommended shelf life >> and dilutions for XTOL Developer. The new recommendations are the same >> as those for KODAK Developer D-76 (full strength and 1:1). The change in >> recommendations does not indicate any change in the formulation of the >> developer. If you have been consistently obtaining satisfactory results >> with diluted developer and you use the mixed developer before keeping >> characteristics can become a concern, you may want to continue your >> current procedures. However, Kodak publications will no longer include >> development recommendations for the 1:2 and 1:3 dilutions of the developer. >> ------------------------------------------------------------------- > > - -- To unsubscribe, see http://mejac.palo-alto.ca.us/leica-users/unsub.html