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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.
高级
1 day
说明
1
1
Divide the emulsion
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.
此步骤所需材料：
细颗粒溴碘化银乳剂5 升所需工具：
玻璃烧杯
大锅（下层，用于水浴）
温度计
不透光盒2
2
Dye four parts, each less
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.
此步骤所需材料：
十五烷基硫杂羰花青染料53 mg所需工具：
等臂天平
玻璃搅拌棒3
3
Blend
Blend
Mix the five parts together into one emulsion.
所需工具：
玻璃烧杯玻璃搅拌棒大锅（下层，用于水浴）4
4
Coat the paper
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.
此步骤所需材料：
纸1 as required所需工具：
浅陶盘不透光盒5
5
Choose contrast with a filter
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.
此蓝图制作
CC0 公共领域
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