If I recall correctly, the silk screen emulsion is UV sensitive. The
question is if it can hold up under any of the commonly used PCB
etchants like ferric chloride or
ammonium chloride, or even muriatic acid and hydrogen peroxide.
If so, you may have had a stroke of genius, if you can find a source for
the silk screen emulsion.
Roland F. Harriston, P.D.
∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗
tda7000 wrote:
>
>
> That would all depend on whether the silk screen emulsion stuff was UV
> sensitive and reacted the same way as normal UV resist, to actually
> stay on or wash off according to the pattern.
>
> --- In Homebrew_PCBs@yahoogroups.com
> <mailto:Homebrew_PCBs%40yahoogroups.com>, "David" <dgh2259@...> wrote:
> >
> > Leon / Andrew,
> >
> > Sorry, I dont think i made myself clear, I was suggesting the
> emulsion used in silk screen printing to be put directly onto the PCB
> using Craig's spinning method, not through a mesh, oven dry it, then
> expose using UV and circuit pattern on a transparency or tracing paper
> as normal, the exposed area would remain and the circuit washed off
> with water ready for etching, if that makes sense! I was also
> wondering if the resist would stand up to the etching chemicals? the
> main reason is, this type of emulsion is a lot cheaper and easier to
> get than the dedicated PCB stuff!
> >
> > David
>
>
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