IṢẸ́ ỌNÀ
ẸWÀ ÀTI ÌLERA
IṢẸ́ ỌWỌ́
ÀṢÀ ÀTI ÌTÀN
ÌṢERÉ
ÀYÍKÁ
OÚNJẸ ÀTI OHUN MÍMU
REVERSE ENGINEERING
SÁYẸ́ǸSÌ
ERÉ ÌDÁRAYÁ
ÌMỌ̀-Ẹ̀RỌ
ÀWỌN OHUN WÍWỌ̀
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.
Ilọsíwájú
4 days
Ìlànà
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.
Àwọn ohun èlò fún ìgbésẹ̀ yìí:
Potassium Bromide12 g
Ìyẹ̀fun gelatin19.4 gÀwọn irinṣẹ́ tí a nílò:
Omi
Ago Gílásì
Ọ̀pá Ìrúwé Gílásì
Òǹwọ̀n ìdọ́gba2
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.
Àwọn ohun èlò fún ìgbésẹ̀ yìí:
Silver Nitrate15 gÀwọn irinṣẹ́ tí a nílò:
Omi
Omi Ammonia Líle (0.880)Ago GílásìỌ̀pá Ìrúwé Gílásì
Ìkòkò ńlá (ti ìsàlẹ̀, fún ìwẹ̀ omi)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.
Àwọn irinṣẹ́ tí a nílò:
Ìkòkò ńlá (ti ìsàlẹ̀, fún ìwẹ̀ omi)
Ẹ̀rọ Ìwọ̀n OoruỌ̀pá Ìrúwé Gílásì4
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.
Àwọn irinṣẹ́ tí a nílò:
Iná Ààbò RúbìAgo GílásìỌ̀pá Ìrúwé GílásìOmi5
5
Ripen
Ripen
Leave the emulsion in the hot water for half to three-quarters of an hour.
Àwọn irinṣẹ́ tí a nílò:
Ìkòkò ńlá (ti ìsàlẹ̀, fún ìwẹ̀ omi)Iná Ààbò Rúbì6
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.
Àwọn irinṣẹ́ tí a nílò:
Àwọn àwo amọ̀ tí kò jinlẹ̀
Àpótí Tí Kò Jẹ́ Kí Ìmọ́lẹ̀ Wọlé7
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.
Àwọn irinṣẹ́ tí a nílò:
Àwo ìyípadà
Aṣọ kánfásì
OkùnOmiIná Ààbò Rúbì8
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.
Àwọn irinṣẹ́ tí a nílò:
Asẹ́
Aṣọ muslin
Ọtí tí a bà jẹ́
Ìgò Gílásì OnídìíIná Ààbò Rúbì9
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.
Àwọn ohun èlò fún ìgbésẹ̀ yìí:
Bébà10 ewéÀwọn irinṣẹ́ tí a nílò:
Ìkòkò ńlá (ti ìsàlẹ̀, fún ìwẹ̀ omi)
Àwo dígí
Ìwọ̀n Ìtẹ́júỌ̀pá Ìrúwé GílásìIná Ààbò Rúbì10
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.
Àwọn irinṣẹ́ tí a nílò:
Àká ÌgbẹÀpótí Tí Kò Jẹ́ Kí Ìmọ́lẹ̀ WọléÀwọn ohun-èlò
4- Àyè
- 19.4 gÀyè
- 15 gÀyè
- 10 ewéÀyè
Àwọn irinṣẹ́ tó nílò
20- Àyè
- Àyè
- Àyè
- Àyè
- Àyè
- Àyè
- Àyè
- Àyè
- Àyè
- Àyè
Ìtọ́nisọ́nà yìí ń ṣe
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