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Bromide Paper: Gelatino-Bromide Emulsion Coated on Paper
Bromide paper is paper coated with silver bromide in gelatin, the printing and enlarging paper of the darkroom. Thorpe (1913) gives a beginner's emulsion: gelatin swelled in potassium bromide solution, silver nitrate made clear with strong ammonia, the two joined under ruby light, ripened, set, washed, and spread on paper as on a glass plate. From the moment the silver goes in, work only by ruby light. Grain and ounce figures are Thorpe's; the gram conversions and the 10-sheet batch are ours.
The picture: our own drawing.
高级
4 days
说明
1
1
Swell the gelatin
Swell the gelatin
Dissolve 185 grains (12.0 g) of potassium bromide in 5 oz (142 ml) of water. Cover 300 grains (19.4 g) of hard gelatin with it and stir until it softens and swells.
此步骤所需材料：
溴化钾12 克
明胶粉19.4 克所需工具：
水
玻璃烧杯
玻璃搅拌棒
等臂天平2
2
Dissolve the silver
Dissolve the silver
Dissolve 231 grains (15.0 g) of silver nitrate in 5 oz (142 ml) of water with gentle heat in the water bath. Add strong ammonia (0.880) a little at a time, stirring, until the precipitate that first forms dissolves again.
此步骤所需材料：
硝酸银15 克所需工具：
水
浓氨水（0.880）玻璃烧杯玻璃搅拌棒
大锅（下层，用于水浴）3
3
Melt the gelatin, never above 35 °C
Melt the gelatin, never above 35 °C
Stand both vessels in the pan of water, never above 35 °C, stirring, until the gelatin is perfectly liquid. Up to here ordinary light is fine.
所需工具：
大锅（下层，用于水浴）
温度计玻璃搅拌棒4
4
Add the silver under ruby light
Add the silver under ruby light
From now on, ruby light only. Pour the silver solution into the gelatin in a thin stream, stirring all the time. Rinse the silver beaker with about 1 oz (28 ml) of warm water into the emulsion.
所需工具：
红宝石安全灯玻璃烧杯玻璃搅拌棒水5
5
Ripen
Ripen
Leave the emulsion in the hot water for half to three-quarters of an hour.
所需工具：
大锅（下层，用于水浴）红宝石安全灯6
6
Set in the dark
Set in the dark
Pour it into a flat dish, put it in a light-tight box and let it set for at least 24 hours; two or three days is better.
所需工具：
浅陶盘
不透光盒7
7
Wash through canvas
Wash through canvas
Scrape the set jelly onto wet coarse canvas and tie it into a bag. Knead it under water so it squeezes through in threads. Pour off the water, cover with fresh, wait 5 minutes and pour off: six to eight times.
所需工具：
锅铲
帆布
细绳水红宝石安全灯8
8
Drain and store
Drain and store
Turn the threads onto a strainer covered with a cloth and let the water drain. Rinse with methylated spirit and keep in a lidded jar until coating.
所需工具：
滤网
平纹细布
变性酒精
带盖玻璃罐红宝石安全灯9
9
Coat the paper
Coat the paper
Melt the emulsion in the warm water bath. Lay a sheet of paper flat on a levelled glass slab. Pour emulsion on the middle to cover nearly half the sheet, and spread it to each end with a glass rod 2 inches wider than the sheet, held just off the surface.
此步骤所需材料：
纸10 张所需工具：
大锅（下层，用于水浴）
玻璃板
水平尺玻璃搅拌棒红宝石安全灯10
10
Dry
Dry
When the coat has set, move the sheets to a rack in a drying box with a current of air. They dry in 12 to 48 hours. Keep them in the light-tight box.
所需工具：
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