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Sidero-Cupreatype

Sidero-Cupreatype

REF #3
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Ferric Ammonium Citrate [NH4]{y}[Fe{x}(C6H4O7)] sol. 20%
1
Ammonium copper citrate (NH₄)₂Cu(C₆H₅O₇)₂ sol. 20%
1
Potassium Ferricyanid K3[Fe(CN)6] sol. 8%
2
365nm

Operating procedure

1. Mix the citrates and ferricyanide.
2. Spread onto the paper.
3. Leave to dry for 30 minutes.
4. Expose (7 minutes).
5. Rinse with neutral water for 2 minutes.