← Back to variante (Bleaching with bleach)
Sidero-Cupreatype / Bleaching with bleach

Sidero-Cupreatype / Bleaching with bleach

REF #64
Greyish blue Medium grey White Pinkish beige
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%
365nm

Operating procedure

Used for recolouring behind, particularly with tannins.

Make a normal sidero-cupreatype (sheet #3) with:
- 6 minutes exposure
- 30+30 seconds rinsing
Bleach bath for 1 minute
Washing 30+30+30 seconds