Cyanotype / MnSO4 development

REF #89

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

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

Manganese sulfate MnSO4·H2O sol. 2%

1. Make a basic cyanotype (6 mins), but do not wash with water.
2. MnSO₄ bath for 30 seconds.
3. Wash three times for 30 seconds each time.