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Cyanotype / Ammonia dye - tannic acid

REF #34

Grey brown Grey yellow Grey green Brown

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

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

Ammonia solution NH3·H2O sol. 0.8%

Tannic acid C76H52O46 sol. 3%

365nm

Operating procedure

1. Make a basic cyanotype (6 mins), do not dry.
2. Dip in heavily diluted ammonia for 10 seconds.
3. Wash for 10 seconds.
4. Dip in tannic acid for 1.5 mins.
5. Wash three times for 30 seconds.
6. Leave to dry.

Consignes de sécurité

Corrosive product: Handle with nitrile gloves and safety goggles.

Be careful when preparing diluted ammonia: ammonia vapours are extremely irritating.