Cyanotype / CuSO4-Na2S toning
REF #42
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Operating procedure
1. Make a basic cyanotype (5 min), with 10+10s rinsing, do not dry
2. CuSO4 bath for 30s
3. Rinse for 30 seconds
4. Na2S bath for 10s -> deep black (FeS)
5. Rinse for 30 seconds -> becomes grey-black
After several days, turns brown-yellow
2. CuSO4 bath for 30s
3. Rinse for 30 seconds
4. Na2S bath for 10s -> deep black (FeS)
5. Rinse for 30 seconds -> becomes grey-black
After several days, turns brown-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.