Cyanotype / Zinc toning

REF #15

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

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

Zinc sulfate ZnSO4.7H2O sol. 2%

1. Make a basic cyanotype (5 mins)
2. Wash for 60+30 seconds
3. Soak in ZnSO4 for 2 mins
4. Wash twice for 1 min