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Cyanotype / CuSO4 - DMDTC Toning

REF #82

Brown Coffee Brown Antique Gold Dark Cocoa Brown Golden Beige Pearl White Reddish Brown Light Beige

Potassium Ferricyanid K3[Fe(CN)6] sol. 8%

Ferric Ammonium Citrate [NH4]{y}[Fe{x}(C6H4O7)] sol. 20%

Sodium Dimethyl Dithiocarbamate (DMDTC) C3H6NNaS2 sol. 2%

Copper sulfate CuSO4 sol. 2%

365nm

Operating procedure

1. Make a basic cyanotype (6 min), with 30+30s rinsing, do not dry
2. DMDTC bath for 40s
3. Rinse 30+30+30 seconds
4. CuSO4 bath for 1 min
5. Rinse 30+30+30 seconds

A very warm tone, it's a shame that the paper is coloured (hence the lack of white).