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P.1/2
B/W Enlarging Darkroom Equipment |
B/W Paper Developer There is less paper developer formula. Major classification of B/W paper include warm tone and cold tone. For cold tone paper, Dektol is the most common. Some tens of years ago, there were D72. Since D72 and Dektol were almost identical, supply of Kodak D72 had been terminated. Besides Dektol, Kodak has a new paper developer, Polymax T Developer in concentrated solution. Its feature according to information includes high capacity, excellent keeping quality and suitable for RC and fiber base paper. Selectol-Soft is a soft contrast paper developer for warm and cold tone paper. Stop Bath There are Kodak 28% Acetate Acid, Indicator Stop Bath and Ektaflo Stop Bath. Kodak 28% Acetate Acid is suitable for retouching and film. Indicator Stop Bath is a concentrated solution for storage. Work solution is 1:63 dilution. When it reaches exhaustion, the indicator will show a purple color. Ektaflo Stop Bath is also a concentrated solution, with 1:31 dilution. It is designed with Polymax T Developer and Polymax T Fix, suitable for film processing. Fixer Kodak Fixer is supplied in powder, Rapid Fixer and Polymax T Fixer are supplied in liquid. All these fixers are suitable for film and paper. Hypo Clearing Agent Wetting Agent Hypo Clearing Agent (or Hypo Eliminator) is to draw chemicals from film or paper to prevent mixing with silver grains to form Silver Suphate. Kodak Photo-fol is the most common wetting agent with various concentrations. There are 200, 600 etc. which are the dilution for use. Photo-fol 200 is for 1:200 dilution etc. Besides making water slipping faster in film drying, it is also used for glazing non-coated B/W paper. Some chemicals are used for adjusting errors. Farmer's Reducer is used to reduce over-developement or over-exposure. Chromium Intensifier is used to intensify under-development or under-exposure. Another set of chemicals are various toners. Toners are used to change the photo from neutral black to brown, sepia etc. They are Brown Toner, Poly-Toner, Sepia Toner etc. Note: We are working for separate pages for various chemicals with demonstration. Please refer later. |
The name "Hypo" is a historic mistake. Just before Photography was born, the most difficult part was that scientists at that time could not find the proper chemical to fix the image. In theory, it should be sodium hyposuphite. Therefore when a solution had been found to have that function, they might be too happy to assume the chemical was sodium hyposuphite. They did not realize that the chemical was sodium thiosuphate. Unfortunately, every one accepted hypo and there is not possible to change afterward. |
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B/W Chemicals 1/2 |
B/W Film Processing |
B/W Enlarging |