Cyanotype / SCN - ZnSO4 toning

REF #20

Greyish blue Medium grey White Grey green Sky blue Pearl White Off-White

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

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

Potassium thiocyanate KSCN sol. 10%

Operating procedure

1. Make a basic cyanotype (6 min), with 2 min rinsing.
2. Dry completely. (several days)
3. ZnSO4 bath for 2 minutes
4. Wash for 30+30 seconds
5. Thiocyanate bath for 2 minutes
5. Wash for 30+30+30 seconds

The bottom left corner did not undergo the final wash.