On Mon, 20 Nov 2006 20:06:52 +0100, Dan Pickard <
dlpwebmail@...>
wrote:
>
> I've had no luck with any Sharpie. The lumicolor pen you speek of is the
> best one I've ever used. It has superior holding strength in acid - but
> still fails (lifts off pcb) at the end of the etching process before all
> copper is removed. I haven't tried the lumicolor in FC yet, only sodium
> persulfate. I felt it would hold up better in persulfate but etching
> time is increased so it could be a draw(no pun). I'm also going to try
> the lumicolor in muratic/peroxide acid soon. I've never tried baking the
> lumicolor before etching. I feel it could help...
> Dan
Staedtler specifically formulated some inks for laboratory use to mark
glassware etc.
I think baking helps, but haven't done direct comparisions.
ST