At 5/4/2022 11:58 UTC Morris Odell wrote:
The 6% will do just fine, BUT... since it appears that your solution may be too dilute already, maybe you need to stop adding peroxide - which further dilutes it - and instead add some copper wire to it and let it bubble, bubble, bubble, adding some HCl to provide the Cl needed to turn that copper into CuCl2. With a stronger solution, with some excess Cl in the form of HCl, you shouldn't need peroxide.
Thanks for the tip, I'll do just that!
Realizing it may take some time... please try to remember to let us know the result. It might help a few others who may have strength/peroxide/whatever issues.
I'll hunt down and repost my recipe for making Cupric Chloride solution involving copper wire (or other source of pure copper), hydrochloric acid, peroxide, bubbling with air and patience. If anyone tries it and leaves out the patience, they're on their own. ;-) I'd rather not have to try to figure out how to adjust the result if my recipe isn't followed.
Once made, peroxide won't be required to produce good results when etching PCBs.
JimH
