On 6/5/2013 1:47 PM, Perry Curling-Hope wrote:
> Fastest, cleanest etching 'cut' is accomplished with (Hydro) perchloric
> acid.
> This is dirt cheap and readily available, produced by mixing pool acid
> (HCl,, hydrochloric acid) with hydrogen peroxide, the so called '40 volum=
e'
> (12% H2O2, used as hair bleach and a disinfectant/cleaner which is
> available from a drug store) in appropriate proportions.

What are the "appropriate proportions"?

> Results have been so outstanding, I have not bothered with anything else.
> Perchloric acid is quite safe to work with at these dilutions.
Which dilutions?

> Do not leave the etching tray to dry out...dispose immediately after use
>
What happens if the tray dries out?
What is the appropriate method of disposal?

Thanks!
--=20
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