Photography by Infrared: Its Principles and Applications

By Walter Clark | Go to book overview

Appendix III
KODAK FORMULAS FOR PHOTOGRAPHIC PROCESSING SOLUTIONS
NEGATIVE DEVELOPERS

ELON (METOL)-HYDROQUINONE-BORAX DEVELOPER
(Formula D-76)

A general-purpose developer for negatives, giving moderate contrast and maximum shadow detail.

Avoirdupois
MetricBritish Imperial United States
Water (about 125° F) (52° C) 750.0 cc 120 oz 96 oz
Elon (or Metol) 2.0 grams 140 grains 116 grains
Sodium sulphite, crystals 200.0 grams 32 oz 26 ½ oz
(or, anhydrous) (100.0 grams) (16 oz) (13 ¼ oz)
Hydroquinone 5.0 grams 350 grains 290 grains
Borax, granular 2.0 grams 140 grains 116 grains
Cold water to make 1.0 liter 160 oz 1 gallon

Dissolve the chemicals in the order given,

Use without dilution. Develop about 14 minutes in a tray or 17 minutes in a tank at 68° F (20° C). Greater or less contrast may be obtained by developing longer or shorter times than those indicated.

For tank development the use of the following replenisher is recommended. The life of the developer solution may be extended five to ten times by the use of this replenisher.


REPLENISHER FOR USE WITH FORMULA D-76
(Formula D-76R)
Avoirdupois
Metric.British Imperial United States
Water (about 125° F) (52° C) 750.0 cc 120 oz 96 oz
Elon (or Metol) 3.0 grams 210 grains 175 grains
Sodium sulphite, crystals 200.0 grams 32 oz 26 ½ oz
(or, anhydrous) (100.0 grams) (16 oz) (13 ¼ oz)
Hydroquinone 7.5 grams 1 oz, 93 grains 1 oz
Borax, granular 20.0 grams 3 oz, 83 grains 2 oz, 290 grains
Cold water to make 1.0 liter 160 oz 1 gallon

Dissolve the chemicals in the order given.

Use the replenisher without dilution and add to the tank as required to maintain the level of the solution. Development times will require adjustment according to the extent of exhaustion of the solution.

-448-

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