Homebrew PCBs

I use copper chloride since it can be regenerated indefinitely by
bubbling or by adding a few drops of 30% h202.  Concentrated h202
should be readily available locally.  Hydroponic suppliers usually has
it.  Pool chemical places sells it as a non-chlorine water treatment,
under the name "Baquacil".  I bought mine as "food grade h202" from a
local health food store. ($20/liter)