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Sidero-Cupreatype / Virage EthylX - Bleach

Sidero-Cupreatype / Virage EthylX - Bleach

REF #71
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Ferric Ammonium Citrate [NH4]{y}[Fe{x}(C6H4O7)] sol. 20%
1
Potassium Ferricyanid K3[Fe(CN)6] sol. 8%
2
Ammonium copper citrate (NH₄)₂Cu(C₆H₅O₇)₂ sol. 20%
1
Bleach NaOCl sol. 3.7%
Sodium ethyl xanthate CH3CH2OCS2Na sol. 2%
365nm

Operating procedure

Used to recolour the back, particularly with tannins

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