Cyanotype / Tin toning

REF #14

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

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

Stannous chloride SnCl2 sol. 1%

1. Make a basic cyanotype (5 mins), do not dry
3. SnCl2 bath for 2 mins
4. Wash twice for 1 min

Never use strong acid with cyanide components: risk of very toxic release (HCN)