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Color-Sensitive Gelatin Plates 269
paper. G. F. Greenfield103 strongly advocated the home-sensitizing of plates. Some sort of drying cupboard is essential and a simple form is sketched with gas burner below with the flue running along the bottom and side, with an outlet at the top, thus giving a current of warm air. Using a large dish was found to lead to air-bells and other troubles when seven or eight plates were manipulated at once. A grooved trough was, therefore adopted, and as it was found inadvisable to use the bath more than twice, it became necessary to find the dilution that could be used. It was determined that, taking 500 ccs. of a 1 : 50,000 solution as the standard for 470 sq. ins. of plate area, the bath might be :
Pinachrom, 1 : 1000 ale 3 ccs.
Pinacyanol, 1 : 1000 ale 2 ccs.
Water 1000 ccs.
The quantity to fill a 5x7 developing tank being 1600 ccs. The plates should be placed in the tank and allowed to soak for 18 minutes, then washed under the tap for 5 minutes and dried. Such plates were found to keep good for a month.
George104 recommended for panchromatizing plates up to 6200 the following :
Pinaverdol, 1 : 2000 ale 13.75 ccs.
Homocol, 1 : 2000 ale 9.0 ccs.
Pinacyanol, 1 : 2000 ale 11.5 ccs.
Ammonia 68.75 ccs.
Alcohol, 90 per cent 376 ccs.
Water to 1000 ccs.
For infra-red from 6000 to 9000 :
Pinaverdol sol 9 ccs.
Homocol sol 9 ccs.
Dicyanin, 1 : 2000 ale 13 ccs.
Pinacyanol sol 11.5 ccs.
Ammonia 11.5 ccs.
Alcohol 376 ccs.
Water to 1000 ccs.
F. Monpillard105 in order to obtain more even sensitiveness than was possible with a single dye, tried mixtures of pinacyanol and dicyanin. The actual bath was :
Pinacyanol or dicyanin, 1 : 1000 ale 5 ccs.
Homocol, 1 : 1000 ale 5 ccs.
Ammonia 0.1 ccs.
Water 1000 ccs.
With dicyanin the sensitiveness extended to 7500, with pinacyanol to 6800. The following instructions are given as a standard method:100 The dye solution should be prepared in a measure, the plates dusted and laid in a flat porcelain dish, which is large enough to hold nearly twice the number of plates it is desired to sensitize at one time. These are put at one end of the dish ; the dish is then tilted, and the dye solution poured into