Date sent: Fri, 5 May 2000 13:25:03 -0700 (PDT) From: George L Smyth Subject: Re: High acutance D76 To: infrared@a1.nl Send reply to: infrared@a1.nl --- "Ibrahim PAMUK (Ank,IH)" wrote: > Hi, > > If I am not mistaken George said that he has a high acutance developer > formula. Would it possible to get it and also if there exists some data of > development times especially on HIE. Ibrahim - Sorry for the delayed response. I moved recently and am finally finding the last lost items. Below is Maxim Muir's formula for High Acutance D-76. Maxim was a contributor to Steve Anchell's Darkroom Cookbook. This formula was developed after the publication of the book. Solution A ---------- Water 750ml Metol 10g Sodium Sulfite 40g Sodium Metabisulfite 10g Hydroquinone 25g Water to make 1 liter Solution B ---------- Water 750ml Sodium Metaborate 50g Water to make 1 liter For use, take 1 part A, 1 part B, and 8 parts water. Use normal D76 1+1 times for development as a starting point. The white precipitate that solution A forms is a result of the hydroquinone not going quite into the solution. It will disappear when combined with the other solutions. Share solution A before mixing. This formula solves three D76 problems. 1) Since the alkali is separated from the reducing agents in storage, the shelf life is outstanding - at least a year for the A. 2) The use of sodium metaborate as an accelerator minimizes the problem of rising pH in storage that is found from hydrolizing borax as with the traditional formula. 3) There is only 4 grams of sodium sulfite per liter of working solution. This is at a Crawley FX-1 level. The sulfite "etching" effects are eliminated. Unlike FX-1, this developer produces a D76 tonal gradation. Crawley tends to run soft due to the exclusive use of metol. Hope this helps. Cheers - george ===== Handmade Photographic Images http://members.home.net/hmpi/