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Bromide Paper: Gelatino-Bromide Emulsion Coated on Paper
Charlie

Nilikha ni

Charlie

18. Oktubre 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.
Abantado
4 days

Mga Tagubilin

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.

Mga materyales para sa hakbang na ito:

Potassium BromidePotassium Bromide12 g
Pulbos na gelatinPulbos na gelatin19.4 g

Mga kailangang kasangkapan:

TubigTubig
Basong Salamin na Pang-aghamBasong Salamin na Pang-agham
Panghalong SalaminPanghalong Salamin
Timbangang panimbangTimbangang panimbang
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.

Mga materyales para sa hakbang na ito:

Silver NitrateSilver Nitrate15 g

Mga kailangang kasangkapan:

TubigTubig
Matapang na Solusyon ng Ammonia (0.880)Matapang na Solusyon ng Ammonia (0.880)
Basong Salamin na Pang-aghamBasong Salamin na Pang-agham
Panghalong SalaminPanghalong Salamin
Malaking KalderoMalaking Kaldero
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.

Mga kailangang kasangkapan:

Malaking KalderoMalaking Kaldero
TermometroTermometro
Panghalong SalaminPanghalong Salamin
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.

Mga kailangang kasangkapan:

Rubi na SafelightRubi na Safelight
Basong Salamin na Pang-aghamBasong Salamin na Pang-agham
Panghalong SalaminPanghalong Salamin
TubigTubig
5

Ripen

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

Mga kailangang kasangkapan:

Malaking KalderoMalaking Kaldero
Rubi na SafelightRubi na Safelight
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.

Mga kailangang kasangkapan:

Mababaw na bandehang seramikoMababaw na bandehang seramiko
Kahong Hindi Pinapasukan ng LiwanagKahong Hindi Pinapasukan ng Liwanag
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.

Mga kailangang kasangkapan:

SiyansiSiyansi
Telang canvasTelang canvas
PisiPisi
TubigTubig
Rubi na SafelightRubi na Safelight
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.

Mga kailangang kasangkapan:

SalaanSalaan
Telang muslinTelang muslin
Alkohol na dinenaturalisaAlkohol na dinenaturalisa
Garapong Salamin na May TakipGarapong Salamin na May Takip
Rubi na SafelightRubi na Safelight
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.

Mga materyales para sa hakbang na ito:

PapelPapel10 pilyego

Mga kailangang kasangkapan:

Malaking KalderoMalaking Kaldero
Plantsa ng salaminPlantsa ng salamin
Antas na May BurbuhaAntas na May Burbuha
Panghalong SalaminPanghalong Salamin
Rubi na SafelightRubi na Safelight
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.

Mga kailangang kasangkapan:

Pantuyuang EstantePantuyuang Estante
Kahong Hindi Pinapasukan ng LiwanagKahong Hindi Pinapasukan ng Liwanag

Mga Materyales

4

Mga Kinakailangang Kasangkapan

20

Ang blueprint na ito ay gumagawa ng

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Papel na Bromide

Free

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Ang mga blueprint na ito ay nagbabahagi ng kaalaman — mga teknik, materyales, o prinsipyo

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CC0 Pampublikong Domain

Ang blueprint na ito ay inilabas sa ilalim ng CC0. Malaya kang kumopya, magbago, mamahagi, at gumamit nang walang pahintulot.

Suportahan ang Maker sa pamamagitan ng pagbili ng mga produkto sa kanilang Blueprint Komisyon ng Maker itinakda ng mga Vendor, o lumikha ng bagong bersyon ng Blueprint na ito at isama bilang koneksyon sa iyong Blueprint upang ibahagi ang kita.

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