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Bromide Paper: Gelatino-Bromide Emulsion Coated on Paper
Charlie

Imeundwa na

Charlie

18. Oktoba 2026DE
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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.
Juu
4 days

Maagizo

1

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.

Vifaa kwa hatua hii:

Bromidi ya PotasiamuBromidi ya Potasiamu12 g
Unga wa jelatiniUnga wa jelatini19.4 g

Zana zinazohitajika:

MajiMaji
Bikari ya kiooBikari ya kioo
Fimbo ya Kioo ya KukorogaFimbo ya Kioo ya Kukoroga
Mizani ya mizani-mbiliMizani ya mizani-mbili
2

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.

Vifaa kwa hatua hii:

Nitrati ya FedhaNitrati ya Fedha15 g

Zana zinazohitajika:

MajiMaji
Myeyusho Mkali wa Amonia (0.880)Myeyusho Mkali wa Amonia (0.880)
Bikari ya kiooBikari ya kioo
Fimbo ya Kioo ya KukorogaFimbo ya Kioo ya Kukoroga
Sufuria kubwa (ya chini, kwa maji ya moto)Sufuria kubwa (ya chini, kwa maji ya moto)
3

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.

Zana zinazohitajika:

Sufuria kubwa (ya chini, kwa maji ya moto)Sufuria kubwa (ya chini, kwa maji ya moto)
KipimajotoKipimajoto
Fimbo ya Kioo ya KukorogaFimbo ya Kioo ya Kukoroga
4

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.

Zana zinazohitajika:

Taa Salama NyekunduTaa Salama Nyekundu
Bikari ya kiooBikari ya kioo
Fimbo ya Kioo ya KukorogaFimbo ya Kioo ya Kukoroga
MajiMaji
5

Ripen

Leave the emulsion in the hot water for half to three-quarters of an hour.

Zana zinazohitajika:

Sufuria kubwa (ya chini, kwa maji ya moto)Sufuria kubwa (ya chini, kwa maji ya moto)
Taa Salama NyekunduTaa Salama Nyekundu
6

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.

Zana zinazohitajika:

Trei za kauri fupiTrei za kauri fupi
Sanduku Lisilopitisha MwangaSanduku Lisilopitisha Mwanga
7

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.

Zana zinazohitajika:

Mwiko bapaMwiko bapa
Kitambaa cha kanvasiKitambaa cha kanvasi
UziUzi
MajiMaji
Taa Salama NyekunduTaa Salama Nyekundu
8

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.

Zana zinazohitajika:

ChujioChujio
Kitambaa cha musuliniKitambaa cha musulini
Kileo kilichoharibiwaKileo kilichoharibiwa
Mitungi ya kioo yenye vifunikoMitungi ya kioo yenye vifuniko
Taa Salama NyekunduTaa Salama Nyekundu
9

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.

Vifaa kwa hatua hii:

KaratasiKaratasi10 karatasi

Zana zinazohitajika:

Sufuria kubwa (ya chini, kwa maji ya moto)Sufuria kubwa (ya chini, kwa maji ya moto)
Bamba la kiooBamba la kioo
Rulani ya MajiRulani ya Maji
Fimbo ya Kioo ya KukorogaFimbo ya Kioo ya Kukoroga
Taa Salama NyekunduTaa Salama Nyekundu
10

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.

Zana zinazohitajika:

Kichanja cha KukaushiaKichanja cha Kukaushia
Sanduku Lisilopitisha MwangaSanduku Lisilopitisha Mwanga

Vifaa

4

Zana Zinazohitajika

20

Mchoro huu unatengeneza

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CC0 Umma Wote

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