On bleaching with ferricynide: indeed the spot gets bbigger than you like. I have used a Idonine/methanol bleach in the past (if I rember correctly!) which bleeds less, the methanol evaporates quite fast leaving a small area bleached out. The recipe is at hoem, byt is from one of the books of Tim Rudmen, the master printing course I believe.
Best,
Cor
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