Spot bleaching/white clearing of cyanotypes??

[tgeis]

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

 

[pdeeh]

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.

 

[Iosif]

Since the chemicals are inside the paper fibers, the only way is to use a razor blade - just the same way retouchers did in early photographic years.

 

[removed account4]

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.

+1

that's what i use ..
but i don't spot bleach i bleach the whole print and paint it