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Cyanotype / SnCl2 - Vitamin C toning

REF #23

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. 2%

Ascorbic acid C6H8O6 sol. 1%

365nm

Operating procedure

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

In general, SnCl2 lightens the cyanotype, but with ascorbic acid, the opposite happened.