Film developers tropical

To use, soak the exposed film in the prehardener for 10 minutes with moderate agitation. Then drain the film for a few seconds, immerse in water for 30 seconds, drain thoroughly, and immerse in the developer. In general, developers such as Kodak D-76 may be used up to 95F/35C. Above 95F/35C it may be better to use developers specifically formulated for tropical developing (Tropical Developers High-Temperature Processing up to 105F/40C, above). 

The strippable films deposited from solvents in the cold are much thinner (= 0.05-0.25 mm) than those from the hot-dip materials, and their protective properties are not nearly so good. A possible difficulty which must be watched for is the development of brittleness on ageing and consequent difficulty of stripping. Latex films containing inhibitors such as sodium benzoate have been found to deteriorate under tropical conditions, but may have a use in more temperate climates. 

High temperature film processing not only now permits film to be processed in the tropics and in high temperature locations but allows the specially hardened emulsions to develop very rapidly with no detrimental changes in their characteristics Color Photography... 

Stop Bath for Tropical Development Films should be immersed for three minutes in either Kodak SB-4 Tropical Hardener Bath or Kodak SB-5 Nonswelling Acid Rinse Bath after development and before fixation. Agitate the negative in the stop bath frequently. 

Notes In nonswelling acid rinse baths for roll film and in tropical developers for use at high temperatures. Store in a tightly sealed bottle and store in a cool place. 

NOTE 1 When development is completed, rinse the film in water for 1 or 2 seconds only and then immerse in Kodak SB-4 Tropical Hardener Bath for 3 minutes (omit the water rinse if the film tends to soften). Then fix for at least 10 minutes in an acid-hardening fixing bath, such as Kodak F-5 Hardening Fixer, and wash for 10 minutes in water at not over 95F/35C. 

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