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Cyanotype / CuSO4 - ZnSO4 toning

Cyanotype / CuSO4 - ZnSO4 toning

REF #16
White Grey yellow Pale Beige Pearl White Grayish Mauve Taupe
Ferric Ammonium Citrate [NH4]{y}[Fe{x}(C6H4O7)] sol. 20%
1
Potassium Ferricyanid K3[Fe(CN)6] sol. 8%
1
Zinc sulfate ZnSO4.7H2O sol. 2%
Copper sulfate CuSO4 sol. 2%
365nm

Operating procedure

1. Make a basic cyanotype (5 mins), with 2 mins rinsing, do not dry.
2. ZnSO4 bath for 2 mins.
3. Wash for 30+30 secs.
4. CuSO4 bath for 2 mins.
5. Wash for 30+30+30 secs.