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Cyanotype / Na2CO3 dye - tannic acid

REF #98

Grey brown Tan / Sable Pearl White Taupe Light Taupe Dark Taupe Burnt Umber

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

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

Sodium carbonate Na2CO3 sol. 10%

Tannic acid C76H52O46 sol. 7%

Oxygenated water H2O2 sol. 12%

365nm

Operating procedure

1. Make a basic cyanotype (6 min), but wash for only 30+30s, do not dry.
4. Transfer to tannic acid for 1 min.
5. Wash for 30+30s.
2. Transfer to sodium carbonate for 20 seconds.
3. Wash for 30+30 seconds.
6. Transfer back to hydrogen peroxide for 30 seconds.
7. Wash 3 times for 30 seconds.
8. Leave to dry.