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Cyanotype / Na2CO3 dye - tannic acid

Cyanotype / Na2CO3 dye - tannic acid

REF #31
Grey brown Grey yellow Black Brown Tan / Sable
Ferric Ammonium Citrate [NH4]{y}[Fe{x}(C6H4O7)] sol. 20%
1
Potassium Ferricyanid K3[Fe(CN)6] sol. 8%
1
Sodium carbonate Na2CO3 sol. 10%
Tannic acid C76H52O46 sol. 3%
365nm

Operating procedure

1. Make a basic cyanotype (5 mins), do not dry
2. Dip in sodium carbonate for 3 seconds
3. Wash for 10 seconds
4. Dip in tannic acid for 2 minutes
5. Wash for 10 seconds.
6. Repeat with sodium carbonate for 10 seconds.
7. Wash three times for 30 seconds.
8. Leave to dry.