kunihiko Posted March 28, 2005 Share Posted March 28, 2005 Hi<BR>I've checked the archive but I couldn't find what I want to know. I'msorry if this question has been already answered.<BR>I've been using Pyrocat-HD as my standerd developer for a while and Ilike the results. I don't shoot much, so I want to know how long can Ikeep them in my shelf. Does anyone know that how long the stocksolution keep its performance ? Link to comment Share on other sites More sharing options...
andrew_oneill Posted March 28, 2005 Share Posted March 28, 2005 Solution A, 6 months and that's pushing it. Solution B indefinite. Have you tried mixing smaller portions? Instead of 1000ml, try 100ml. Link to comment Share on other sites More sharing options...
andrew_oneill Posted March 28, 2005 Share Posted March 28, 2005 Here's the formula: Stock Solution A Distilled Water 75ml Sodium Bisulfite 1.0g Pyrocatechin (Catechol) 5.0g Phenidone .2g Potassium Bromide .2g Water to 100ml Stock Solution B Distilled Water 100ml Potassium Carbonate 100g Link to comment Share on other sites More sharing options...
jay_de_fehr Posted March 28, 2005 Share Posted March 28, 2005 Kunihiko, you can dramatically extend the life of the stock A solution (decades)by dissolving it in propylene glycol instead of water. The B solution will keep for quite a long time (years), and is relatively inexpensive in any case. Enjoy. Jay Link to comment Share on other sites More sharing options...
jeffrey moore Posted March 28, 2005 Share Posted March 28, 2005 The creator of Pyrocat-HD, Sandy King, hangs out in the B&W forum on the APUG site (www.apug.org). If you post your question there you will very likely get the answer straight from the horse's mouth, so to speak. Link to comment Share on other sites More sharing options...
sandy_king Posted March 28, 2005 Share Posted March 28, 2005 Based on my own tests, and the reported experiences of many other users of Pyrocat- HD, I estimate the shelf life of Stock Solution A, mixed in distilled water, to be on the order of about 8-12 months, +/- 3-6 months for unfavorable or favorable storage conditions.This assumes no contamination of one of the stock solutions with the other. As Jay mentions, mixing Stock Solution A in propylene glycol gives the Stock A solution very long shelf life, on the order of years and years. Sandy Link to comment Share on other sites More sharing options...
kunihiko Posted March 29, 2005 Author Share Posted March 29, 2005 Thank you all !<BR> Since we don't have much information about Pyrocat-HD in Japan, your answers are very helpfull.<BR> I would try propylene glycol next time. Link to comment Share on other sites More sharing options...
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