Archive of the former Yahoo!Groups mailing list: Homebrew PCBs

I live in a small largely agricultural country any chemical is difficult
to obtain (unless it has a household or agricultural use). I'd like to
try hydrochloric acid and hydrogen peroxide as an etchant and I can buy
HCl in the hardware store (for cleaning concrete) but H2O2 is a little
more difficult $25 / litre for 35% plus hazardous goods freight from
300Km away. Sodium Percarbonate is cheap and readily available as a
cleaning agent. In solution Sodium Percarbonate becomes sodium carbonate
and hydrogen peroxide. It seems to me that a mixture of hydrochloric
acid and sodium percarbonate would end up as hydrochloric acid, hydrogen
peroxide, salt and carbon dioxide. Has anyone tried percarbonate in this
way as an etchant?