The developer Pyrocat HD is mixed from individual chemicals that may be purchased from Artcraft or Photographers Formulary. The recipe for this developer may be found on Unblinkingeye.com. It is listed under the heading Formulae. There is also an article on the Unblinkingeye site that was written by Clay Harmon in which he covers testing of this developer with several different films. Hope this is some help to you. Good luck.