727. For those who experience difficulty in securing absolutely pure chemicals, or who do not care to compound their own developers, we recommend the use of the liquid developers put up by manufacturers.

728. " N. A." Liquid Developer. - This is an excellent ready-to-use concentrated developer for Velox papers. Unlike some other developers it has certain qualities which make it unique in photographic work. " N. A." (non-abrasion) means that all abrasion or friction marks, to which glossy developing-out papers are particularly susceptible, will be prevented by the use of 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 diluted, and it is well to remember that the strength of the developer regulates the softness of the print.

729. The following formula should be used for Special Velox:

N. A. Velox Liquid Developer............................

. 1 oz.

Water..........................................

4 ozs.

730. Formula For Regular Velox

Formula For Regular Velox.

N. A. Velox Liquid Developer............................

2 ozs.

Water............................................

4 ozs.

731. It is important that the temperature of the developing solution should be 70° Fahr. In summer, if necessary to cool the developer, do not place ice in the solution, as it will cause dilution. Place the tray containing the developer into one of the larger size, packing a little ice around it.

732. Note

Note. "N. A." developer should not be used for developing plates or films.