Developing-Out Papers 
DEVELOPMENT OR GASLIGHT PAPERS.—These are com- 
paratively slow papers, which can be manipulated in not too 
bright a white light, though it is safer to use a yellow or 
bright orange safe-light. 
ExposuRE.—The exposure is much longer than with bro- 
mide paper, and it is advisable to use a high candle-power in- 
candescent lamp, such as a 50-watt Mazda. The distance 
from the lamp should not be more than 12 inches. Or mag- 
nesium ribbon may be used, 1 inch at a distance of 12 inches 
being sufficient for an average negative for cold tones. The 
longer the exposure, with corresponding increase of bromide 
in the developer, the warmer the tones. 
DEVELOPMENT.—Any developer may be used, and, prac- 
tically, negative developers, with bromide, may be used full 
strength. 
Amidol.— 
Sodium sulphite, dry 32 g V4 oz. 
Potassium bromide 0.13 g 1 gr. 
Water 1000 ccm 16 oz. 
When dissolved, add: 
Amidol 5.22 40 er. 
For notes as to the keeping of this, see under Bromide Paper. 
Metol-Hydrochinon.—The mean of the maker’s formulas 
1S: 
Metol 19¢ 14¥4 gr. 
Hydrochinon 6.2 g 47 gr. 
Sodium sulphite, dry 28 g 215 gr. 
Sodium carbonate, dry 41g 315 gr. 
Potassium bromide 0.4¢ 3 gr. 
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