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Cyanotype / MnSO4 toning

Cyanotype / MnSO4 toning

REF #37
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Potassium Ferricyanid K3[Fe(CN)6] sol. 8%
1
Ferric Ammonium Citrate [NH4]{y}[Fe{x}(C6H4O7)] sol. 20%
1
Manganese sulfate MnSO4·H2O sol. 2%
365nm

Operating procedure

1. Make a basic cyanotype (5 min), but limit rinsing to 10+5s, do not dry.
2. MnSO4 bath for 30s.
3. Wash 3 times for 30 seconds.

Incomplete washing allows the formation of manganese ferricyanide (brown-pink shadow).