-stains the copper too much - stick with peroxide/ammonia
>>> COwEv <[log in to unmask]> 03/20/98 11:29am >>>
Hi
We use a solution of
Sodium dichromate - 10 g/l
Sulphuric acid - 100 ml / l
Swab etch for 10 seconds max. and rinse off.
Chris
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