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Cyanotype / CuSO4 - Vitamin C toning

Cyanotype / CuSO4 - Vitamin C toning

REF #46
Greyish blue Medium grey White Tan / Sable Pinkish beige
Potassium Ferricyanid K3[Fe(CN)6] sol. 8%
1
Ferric Ammonium Citrate [NH4]{y}[Fe{x}(C6H4O7)] sol. 20%
1
Copper sulfate CuSO4 sol. 1%
Ascorbic acid C6H8O6 sol. 2%
365nm

Operating procedure

1. Make a basic cyanotype (5 mins), with 2 mins rinsing, do not dry.
2. CuSO4 bath for 7 mins.
3. Wash for 10 secs.
4. Ascorbic acid bath for 1 min.
5. Wash for 2 mins.