Cyanotype / MnO4 - ZnSO4 toning

REF #19

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

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

Zinc sulfate ZnSO4.7H2O sol. 2%

Manganese sulfate MnSO4·H2O sol. 2%

1. Make a basic cyanotype (6 mins)
2. ZnSO4 bath for 2 mins
3. Wash for 30+30 secs
4. MnSO4 bath for 2 mins
5. Wash for 30+30+30 secs