The question here has been a replacement for the persulfate.
5 or S
2O2−
8. . . . These salts are strong oxidizers."
I'm not sure what the copper reaction with the persulfate would be, but it obviously doesn't involve HCl, and since the persulfate is an oxidizer, won't require H2O2. If you use the CuCl or FeCl etchants, you can't avoid HCl in the process - it's part of the reaction.
It's been too long (65+years) since my high school/college chemistry!
Norm
From Wikipedia, the free encyclopedia
"The term persulfate (sometimes known as peroxysulfate)
refers to ions or compounds containing the anions SO2−5 or S
2O2−
8. . . . These salts are strong oxidizers."
I'm not sure what the copper reaction with the persulfate would be, but it obviously doesn't involve HCl, and since the persulfate is an oxidizer, won't require H2O2. If you use the CuCl or FeCl etchants, you can't avoid HCl in the process - it's part of the reaction.
It's been too long (65+years) since my high school/college chemistry!
Norm