Product Description
[Formula D-9] Hydroquinone-Caustic Developer
For Extreme Contrast on Process and Panchromatic Process Films and Plates For Tray Development
Stock Solution A
Avoirdupois
Metric
Water (about 125° F.) (52° C.)
16 ounces
500 cc
Sodium Bisulphite, (E.K. Co.)
¾ ounce
22.5 grams
Hydroquinone
¾ ounce
22.5 grams
Potassium Bromide
¾ ounce
22.5 grams
Water to make
32 ounces
1.0 liter
Stock Solution B
Cold Water
32 ounces
1.0 liter
Sodium Hydroxide (Caustic Soda)
1¾ ounces
52.5 grams
Dissolve chemicals in the order given.
Use equal parts of A and B and develop for not more than two minutes at 65° F. (18° C.).
Cold water should always be used when dissolving sodium hydroxide (caustic soda) because considerable heat is evolved. If hot water is used, the solution will boil with violence and may cause serious burns if the alkali spatters on the hands or face. Solution A should be stirred thoroughly when the caustic alkali is added; otherwise the heavy caustic solution Will sink to the bottom.
Wash thoroughly after development and before fixing, or stains and dichroic fog may result.
