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Cyanotype / Chrome alun - DMDTC Toning

REF #106

Medium grey White Black Pearl White Taupe Dark grey Light Grey

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

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

Sodium Dimethyl Dithiocarbamate (DMDTC) C3H6NNaS2 sol. 2%

Chrome alum KCr(SO4)2·12(H2O) sol. 2%

365nm

Operating procedure

1. Make a basic cyanotype (6 min), with 30+30s rinsing, do not dry.
2. Chrome alum bath for 2 min.
3. Rinse for 30+30+30 seconds.
4. DMDTC bath for 1 min.
5. Rinse for 30+30+30 seconds.

A very "silver-based" black and white, but without silver!