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Sidero-Cupreatype / Ammonia Bleaching

Sidero-Cupreatype / Ammonia Bleaching

REF #67
Greyish blue White Sky blue
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
Ammonia solution NH3·H2O sol. 13%
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
Ammonia bath for 10 seconds
Washing 30+30+30 seconds

Once again: be careful with ammonia: ventilate well, protect your hands and mucous membranes