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 volume'
(12% H2O2, used as hair bleach and a disinfectant/cleaner which is
available from a drug store) in 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.

Do not leave the etching tray to dry out...dispose immediately after use





On Wed, Jun 5, 2013 at 3:52 PM, Matt Rhys-Roberts <
matt.rhys-roberts@envinsci.co.uk> wrote:

> oops, copied the wrong thing down... I meant Sodium Peroxidisulfate. Sorr=
y
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Perry Curling-Hope

Research and Development
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