Cyanotype / CuSO4-Na2S toning
REF #43
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Operating procedure
1. Make a basic cyanotype (5 min), with 2 min rinsing, do not dry.
2. Na2S bath for 10 sec -> deep black (FeS).
3. Rinse for 30 seconds.
4. CuSO4 bath for 30 sec.
5. Rinse for 30 seconds -> becomes grey-black.
After several days, turns grey-yellow
2. Na2S bath for 10 sec -> deep black (FeS).
3. Rinse for 30 seconds.
4. CuSO4 bath for 30 sec.
5. Rinse for 30 seconds -> becomes grey-black.
After several days, turns grey-yellow
Consignes de sécurité
Na₂S can be very irritating to the skin and eyes.
Na₂S can transform into H₂S in humid environments, which can be highly toxic => work under a fume cupboard is mandatory.