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1, the preparation of the developer is not strictly formulated according to the proportion of formula. The alkalinity of the developer is too strong, the developer is easily oxidized and discolored, the developer is used for too long, the effect of development is significantly reduced, the developer is oxidized to reddish brown, and the performance of the developing is also easily weakened or even disappeared. The films shown by the above developer solutions are colored yellow or brown due to discoloration of the surface film.
Under normal circumstances, hard lines are used for photocopying, copying, and electrical separation. High-contrast, high-stability developing solutions are all used as a kit, which can continuously wash 8m2 of film. The developer must be used for a long time. Replace new medicine.
2. The fixing solution uses sodium thiosulfate + water + sodium sulfite. The formulation of the fixing solution: sodium thiosulfate: 350 g, sodium sulfite: 8 g, water: 1000 ml.
The purpose of the fixing is to permanently fix the image of the proper density and contrast after development. The function of the fixing solution is to neutralize the alkaline substance of the developer with its acidic substance to stop the development, fix the image and dissolve the non-photosensitive silver halide. Sodium thiosulfate in the fixer is exposed to excessively strong acidic substances, or the temperature is too high, free sulfur will precipitate, and these free sulfurs can react with the silver particles on the film to produce silver sulfide. The color of the silver sulfide is brown, so the color of the film is also dyed brown. Therefore, the acidity during the preparation of the fixing solution should not be too strong, and the temperature of the fixing solution should not be too high.
3. Improper concentration of the fixer can also cause yellowing of the film. Because of the speed of the film's fixing, it depends on the amount of sodium thiosulfate in the fixing solution. The fixing solution has a high concentration and the fixing speed is fast. If the fixing solution concentration exceeds 45%, the fixing solution is too thick, the film The unsensitized silver halide has the smallest solubility, but it lowers the solubility, making it counterproductive. Therefore, when the fixing density is not properly grasped, the effectiveness of the fixing solution can be weakened, and the fixing is not deeply penetrated and yellowing occurs.
4, the fixing solution is old and lack of fixing, can not make the film yellow. The use of the fixer for a long period of time degrades the performance of the fixer and lacks the effect of fixing, so that the unsensitized silver halide is completely dissolved. These undissolved silver salts, which remain in the emulsion film, can cause the film to appear yellow after processing.
5. After the photosensitive film is put into the fixing basin when fixing, be sure to pay attention to the shaking operation method. It is required to shake the developer basin to shake the fixer or to turn the film upside down. The purpose is to fully dissolve the photosensitive film thoroughly and thoroughly. The unsensitized silver halide is completely dissolved in the fixing solution. If the photosensitive film is not put into the fixing basin, it will not roll or shake. Fixing in a standing state will result in insufficient fixing, and residual sulfides will adhere to the film, causing yellowing and browning.
6. Yellowing due to insufficient washing after fixing. After the film is fully fused, it should be placed in the flushing tank. 
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