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Cyanotype / CuSO4 - Vitamin C toning

Cyanotype / CuSO4 - Vitamin C toning

REF #48
Medium grey White Grey brown Grey yellow 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. 5%
Ascorbic acid C6H8O6 sol. 0.4%
365nm

Operating procedure

1. Make a basic cyanotype (5 mins), with 2 mins of rinsing, do not dry.
2. CuSO4 bath for 5 mins.
3. Wash for 10 seconds (stop as soon as copper hydroxide appears).
4. Ascorbic acid bath for 30 seconds.
5. Wash for 2 minutes.

The image will almost disappear and then reappear the next day.