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Cuprea-Van Dyke

Cuprea-Van Dyke

REF #110
Grey brown Black Dark Cocoa Brown Taupe Light Taupe Grayish Lavender Chocolate Brown Burnt Umber
Ferric Ammonium Citrate [NH4]{y}[Fe{x}(C6H4O7)] sol. 20%
5
Silver nitrate AgNO3 sol. 10%
2
Oxalic acid HOOC-COOH,2H2O sol. 5%
2
Ammonium copper citrate (NH₄)₂Cu(C₆H₅O₇)₂ sol. 20%
5
Sodium thiosulfate Na2S2O3 sol. 10%
365nm inactinique

Operating procedure

The use of copper citrate in addition to iron citrate will give a clearer image and better contrast management than in Van Dyke.

All under a safelight:

1. Mix the citrates, oxalic acid and nitrate.
2. Spread the mixture onto the paper.
3. Expose. (5 min).
4. Wash for 4 x 30 seconds.
5. Fixer bath for 30 seconds.
6. Wash for 30 + 30 + 30 seconds.