I am trying to find a way to spot bleach out certain areas of blue, after the exposure/washing process. I have tried household bleach but it leaves the white yellowish. I am looking for a clear white. Any pointers are much appreciated! Thanks
Alkaline solutions will bleach cyanotypes - Sodium carbonate (washing soda) at 1% or 2% for instance.
Quite how spot bleaching might work in a process where the pigment is embedded in the paper and the bleach will necessarily spread in the fibres ... well, you'll have to experiment.
Alkaline solutions will bleach cyanotypes - Sodium carbonate (washing soda) at 1% or 2% for instance.
Quite how spot bleaching might work in a process where the pigment is embedded in the paper and the bleach will necessarily spread in the fibres ... well, you'll have to experiment.