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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.
Lanjutan
4 days
Instruksi
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.
Material untuk langkah ini:
Kalium Bromida12 g
Bubuk gelatin19.4 gAlat yang dibutuhkan:
Air
Gelas Beker Kaca
Batang Pengaduk Kaca
Neraca lengan2
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.
Material untuk langkah ini:
Perak Nitrat15 gAlat yang dibutuhkan:
Air
Larutan Amonia Pekat (0,880)Gelas Beker KacaBatang Pengaduk Kaca
Panci besar (bawah, untuk penangas air)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.
Alat yang dibutuhkan:
Panci besar (bawah, untuk penangas air)
TermometerBatang Pengaduk Kaca4
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.
Alat yang dibutuhkan:
Lampu Aman Merah DelimaGelas Beker KacaBatang Pengaduk KacaAir5
5
Ripen
Ripen
Leave the emulsion in the hot water for half to three-quarters of an hour.
Alat yang dibutuhkan:
Panci besar (bawah, untuk penangas air)Lampu Aman Merah Delima6
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.
Alat yang dibutuhkan:
Baki keramik dangkal
Kotak Kedap Cahaya7
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.
Alat yang dibutuhkan:
Sutil
Kain kanvas
TaliAirLampu Aman Merah Delima8
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.
Alat yang dibutuhkan:
Saringan
Kain mori
Alkohol terdenaturasi
Toples Kaca BertutupLampu Aman Merah Delima9
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.
Material untuk langkah ini:
Kertas10 lembarAlat yang dibutuhkan:
Panci besar (bawah, untuk penangas air)
Lembaran kaca
WaterpasBatang Pengaduk KacaLampu Aman Merah Delima10
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.
Alat yang dibutuhkan:
Rak PengeringKotak Kedap CahayaBahan
4- 12 gPlaceholder
- 19.4 gPlaceholder
- 15 gPlaceholder
- 10 lembarPlaceholder
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