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Cyanotype / Chromium alum - SnCl2 toning

REF #24

Greyish blue White Navy blue Sky blue Pale Lavender Lavender White

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

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

Stannous chloride SnCl2 sol. 1%

Chrome alum KCr(SO4)2·12(H2O) sol. 2%

Operating procedure

1. Make a basic cyanotype (6 min), with 30+30s rinsing, do not dry.
2. SnCl2 bath for 2 min.
3. Wash twice for 30 seconds.
4. Chromium alum bath for 2 min.
5. Wash three times for 30 seconds.