Contaminated pickle

Hi. I am new to this but am enjoying my first few days here.

I heard Charles Lewton-Brain tell a small group at a SNAG conference
(some years ago) how to rectify a pickle that was accidentally
contaminated by steel tweezers. Unfortunately I didn’t record the
remedy. Anyone know the process?

Also does that 50/50 solution of hydrogen peroxide and remove the
accidental copper plating which occured due to contaminated pickle?

jeanette payne