Homebrew PCBs

Hi
Looking to go with this method!

I have found some Hydrogen Peroxide that is 6% (20 vol), and some
Hydrochloric acid which is only 16% (5ltr brick cleaner in Jewsons)

Would these items be ok to use in a 2:1 mix, need about 3ltr to use
in a megga uk heated\air bubble type etchant tank ?

I would like to convert the solution to a cupric chloride etchant
what's the best way to do this ?

anyone point me in the right direction 

Thanks
Howard