[sdiy] Etching PCBs with non-toxic chemicals

[David G. Dixon]

> It seems that one can etch PC boards with vinegar, hydrogen 
> peroxide, and salt. I've kind of sworn off etching my own 
> boards, but this discovery tickles me enough that I might 
> have to try it.

I use hydrogen peroxide and hydrochloric (a.k.a. muriatic) acid.  Same basic
reaction, and it works a treat.  I've been using the same bottle of solution
for two years.  Occasionally, each time I use it, I add a teaspoon of 30%
hydrogen peroxide, and occasionally I throw in a dollop of acid.