Cyanotype / CuSO4-Na2S toning
REF #44
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Operating procedure
1. Make a basic cyanotype (6 min), with 30+30s rinsing, do not dry
2. Heat with a hairdryer
3. Na2S+NH3 bath for 30s
4. Basic rinsing (pH9) for 30 seconds
5. CuSO₄ bath for 5 min
6. Rinse for 30 seconds
After several days, it turns grey-yellow
2. Heat with a hairdryer
3. Na2S+NH3 bath for 30s
4. Basic rinsing (pH9) for 30 seconds
5. CuSO₄ bath for 5 min
6. Rinse for 30 seconds
After several days, it turns grey-yellow
Consignes de sécurité
Be careful when preparing diluted ammonia: ammonia vapours are extremely irritating.
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.