The copper probably will not work. The Ammonium EDTA + Ferric Chloride in proper molar ratios + 10% excess of Ammonium EDTA will make a pretty good bleach when adjusted to pH 6.5. This is what I used initially before the startup of the EK plant making Ferric Ammonium EDTA directly.

1 mole of Ferric Chloride + 1.1 moles of Ammonium EDTA should do the job. Adjust pH with Acetic Acit 28% and Ammonium Hydroxide solution as needed.

PE