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Cyanotype / DMDTC - Pb(NO3)2 Toning

Cyanotype / DMDTC - Pb(NO3)2 Toning

REF #103
White Pale Mauve Grayish Mauve Taupe Light Taupe Pinkish White Chocolate Brown Burnt Umber
Potassium Ferricyanid K3[Fe(CN)6] sol. 8%
1
Ferric Ammonium Citrate [NH4]{y}[Fe{x}(C6H4O7)] sol. 20%
1
Lead nitrate Pb(NO3)2 sol. 2%
365nm

Operating procedure

1. Make a basic cyanotype (6 min), with 30+30s rinsing, do not dry
2. Pb(NO3)2 bath for 1 min
3. Rinse for 30+30+30 seconds
4. DMDTC bath for 40 seconds
5. Rinse for 30+30+30 seconds

The reverse reaction (first DMDTC, then lead nitrate) will discolour to a greenish-grey (like discolouration with ammonia).