Sidero-Cupreatype / EthylX turn

REF #57

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

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

Ammonium copper citrate (NH₄)₂Cu(C₆H₅O₇)₂ sol. 20%

Sodium ethyl xanthate CH3CH2OCS2Na sol. 2%

Make a normal sidero-cupreatype (sheet #3) with:
- 12 minutes exposure
- 30+30 seconds rinsing
EthylX bath for 10 seconds