METRIC SYSTEM.
Water, ro ozs.=,30o c. c.
Metol, - - - - - - 7 grains=Y2 gramme - - - - 3o grains=2 grammes Sulphite Soda (desiccated) - - IT° grains=7 grammes Carbonate Soda (desiccated) - zoo grains=r3 grammes io per cent. solution Bromide Potassium, 4o drops—go drops This solution will keep indefinitely if placed in bottles filled to the neck and tightly corked. It should be used full strength for " Regular Velox," but can be diluted with equal parts of water when " Special " papers are developed.
NOTE. —In England, Canada, or wherever the British Pharmacopceia is official, use 1,5o grains of desiccated sodium carbonate instead of zoo.
This is an excellent ready to use, concentrated developer for Velox papers. Unlike any other developer, it has certain qualities which make it unique in photographic work. N. A. (non-abrasion) means that all abrasion or friction marks, to which all glossy developing-out papers are particularly susceptible, will be prevented by this solution. Another feature is the guide it gives to thorough fixing—the print is not absolutely fixed until the canary yellow color entirely disappears by fixing in a correctly prepared Acid Hypo Bath. This developer yields the softest possible prints when undiluted and it is well to remember that the stronger the ezvloper, the softer the print.
The following formula should be used for Special Velox : N. A. Velox Liquid Developer, - - - - I oz.
Water 4 ozs. Developer for Regular Velox : N. A. Velox Liquid Developer, - - - - 2 ozs.
Water, 4 ozs.
It is important that the temperature of the developing solution should be 7c) degrees Fahr. In summer, if found necessary to cool the developer,
do not place ice in the solution, as it will dilute it. Place the tray contain ing developer into one of larger size, packing ice around it. N. A. Developer should not be used for developing plates or films.
This is known as the " universal developer because it may be used not only for Velox, but Azo, Bromide paper, films or plates. Like all Nepera liquids, it is a concentrated solution with the combination of purest chemicals which will give the best results. It differs from N. A. Velox Liquid Developer in that it does not possess the non-abrasion and fixing guide properties ; but on the other hand, when used in combination with Nepera Capsules, four of which accompany each 4-oz. bottle, it is excellent for films or plates, giving negatives of the quality best suited for developing out paper.
For Regular Velox use : Nepera Solution, - - = - - 2 ozs.
- - - ----- 4 ozs.
For Special Velox use : Nepera Solution, - - - - - - i oz.
Water, - - - - - - - - 4 ozs.
The temperature of the bath should he 7o degrees Fahr.
For film in Kodak Tank Developer or Kodak Developing Machine use : Nepera Solution, l.c oz.
Water, - - - -- --- 12 02S.
Contents of one Nenera Capsule. Develop fur 20 minute,.
Without Tank or Developing Machine, using factorial system, io is the factor, use Nepera Solution, !:<, oz.
Water, - - ------ S ozs.
Contents of one Nepera Capsule. Temperature should be 6o degrees Fahr.