High-durable liquid concentrate of a finegrain, contrast-working phenidonehydroquinone negative developer. The developer is designed for the manual processing of all sorts of perforated/roll/sheet negative films. Dilution 1 part of the concentrate + 10 to 14 parts of water. Developing capacity: One package is sufficient to develop 12 perforated films (135-36) or rollfilms (120), or a corresponding amount of sheet films (up to 30 sheets 13 x 18 cm, etc.). Packaging PE-bottle of 250 ml.