I use my formula,
1 part Muriatic Acid (31%) to 2 parts Hydrogen Peroxide
(3%),
on blue film negative resist. It is supposed to be DuPont
Riston but I got it on eBay so it could be anything. It
works.

Allen

> -----Original Message-----
> From: piclist-bounces@mit.edu [mailto:piclist-
> bounces@mit.edu] On Behalf Of Matt Rhys-Roberts
> Sent: Friday, June 07, 2013 4:28 AM
> To: Microcontroller discussion list - Public.
> Subject: Re: [EE] differences between ferric chloride and
> sodium metasilicate PCB etchants?
>=20
> Great to get such detailed replies, much appreciated.
>=20
> Can I assume that all the etchant solutions discussed so
far
> are
> compatible with commercial UV etch resist PCBs?
>=20
> Thanks
> Matt
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