What strength hcl are you using? The ratio is easily understood, but
it all depends on the strengths. (I see you use 3 percent h2o2.)
Thanks
Dave
-=-=-=-
>I use this technique all the time. I can do a 4X6 inch board in
>about 2 minutes. I use 1 Part HCL and 2 Parts 3% H2O2. I make just
>enough etchant to cover the board about 1/8 to 1/4 inch and lightly
>brush the surface with a foam Paint brush. I etch at room
>temperature. Works very well for me.
>
>I've also tried 1 part HCL and 2 parts 12% H2O2 but the reaction was
>too fast and hot to control easily.
>
>
>
>--- In Homebrew_PCBs@yahoogroups.com, "tda7000" <Tda7000@...> wrote:
>>
>> I see some people get very fast etch times with a sponge and
>>ferric chloride...
>>
>> But has anyone tried that method with the HCl and H2O2 solution,
>>or the cupric chloride?
>>
> > Or anything else for that matter?