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Variable Contrast Paper: One Emulsion in Five Parts Dyed 30, 15, 6, 2 and 0 mg per Litre (Schwarz, Bell & Howell, US 2,620,272)
Charlie

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Charlie

31. Oktoba 2026DE
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Variable Contrast Paper: One Emulsion in Five Parts Dyed 30, 15, 6, 2 and 0 mg per Litre (Schwarz, Bell & Howell, US 2,620,272)

Variable contrast paper lets one box of paper print hard or soft: the colour of the printing light chooses. Schwarz split one emulsion into parts, dyed each with a halving dose of a green-sensitising dye, and blended them back. Blue light then works on every grain and gives hard prints; green light reaches only the dyed grains and gives soft ones, with smooth steps between. Result: variable contrast paper, hard through a blue or magenta filter, softer through yellow, softest through orange or light red. Source: Schwarz, US 2,620,272 (Bell & Howell, 1952), Example 3. Unknown: the emulsion and the dye, as the patent gives no recipe for either. Not given: dye solvent, coating thickness, drying. Picture drawn by Youblob.
Juu
1 day

Maagizo

1

Divide the emulsion

Warm a fine-grain bromide emulsion of low iodide content until liquid and divide it into five equal parts. Ours: 1 litre each, working in the dark.

Vifaa kwa hatua hii:

Emalsheni ya bromoiodidi ya fedha ya chembe lainiEmalsheni ya bromoiodidi ya fedha ya chembe laini5 lita

Zana zinazohitajika:

Bikari ya kiooBikari ya kioo
Sufuria kubwa (ya chini, kwa maji ya moto)Sufuria kubwa (ya chini, kwa maji ya moto)
KipimajotoKipimajoto
Sanduku Lisilopitisha MwangaSanduku Lisilopitisha Mwanga
2

Dye four parts, each less

Stir the Formula 3 dye into four of the parts: 30 mg per litre, 15 mg, 6 mg and 2 mg. Leave the fifth part undyed. Dye solvent: not given.

Vifaa kwa hatua hii:

Rangi ya pentadesili thiakabosianiniRangi ya pentadesili thiakabosianini53 mg

Zana zinazohitajika:

Mizani ya mizani-mbiliMizani ya mizani-mbili
Fimbo ya Kioo ya KukorogaFimbo ya Kioo ya Kukoroga
3

Blend

Mix the five parts together into one emulsion.

Zana zinazohitajika:

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)
4

Coat the paper

Coat the blended emulsion on the paper base as usual, as one layer, and let it set and dry in the dark. Thickness and drying: not given.

Vifaa kwa hatua hii:

KaratasiKaratasi1 as required

Zana zinazohitajika:

Trei za kauri fupiTrei za kauri fupi
Sanduku Lisilopitisha MwangaSanduku Lisilopitisha Mwanga
5

Choose contrast with a filter

Print without a filter or through blue or magenta for hard, line-like contrast; through yellow for half tones; through orange or light red for softer still.

Vifaa

3

Zana Zinazohitajika

7

Mchoro huu unatengeneza

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Kishikilia nafasi

Karatasi ya picha (multigrade)

Free

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Blueprint zinazohusiana

Blueprint hizi zinashiriki maarifa — mbinu, vifaa au kanuni

Bromide Paper: Gelatino-Bromide Emulsion Coated on Paper

Bromide Paper: Gelatino-Bromide Emulsion Coated on Paper

na CharlieDE

Isiyo hai

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CC0 Umma Wote

Mchoro huu umetolewa chini ya CC0. Uko huru kunakili, kubadilisha, kusambaza, na kutumia kazi hii kwa madhumuni yoyote, bila kuomba ruhusa.

Saidia Mtengenezaji kwa kununua bidhaa kupitia Mchoro wao ambapo wanapata Kamisheni ya Mtengenezaji iliyowekwa na Wachuuzi, au unda marudio mapya ya Mchoro huu na uiunganishe kama kiungo katika Mchoro wako kuchangia mapato.

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