This actually gave me an idea. It might be hard to implement, but if
you could get a thin masking material and laser etch your pattern
through it so that it becomes something like an eraser shield (if
anyone's familiar with the old pencil and paper drafting days), then
use it as a mask and spray on a resist (hair spray?).
Is there a material out there that would melt away at very low
temperature, but be robust enough to handle? And how hard would it be
to get a powerful enough laser and build the beam splitters? I
suppose you might be able to adapt the scanner module from a laser
printer... Just thinking out loud here. It's probably not
economically feasible, huh?
--- In Homebrew_PCBs@yahoogroups.com, Mycroft2152 <mycroft2152@...> wrote:
>
> What you are looking for is called a "mordant". It is
> used on cotton fabric to help the dye molecule adhere
> to the fiber.
>
> Think of it also as a "primer"
>
> The problem is to find one that reacts on the ink, but
> doesn't block the etchant.
>
> I tried a light coating of hair spray before printing.
> I can tell you from expeerience, cured hair spray is
> an excellent resist! ;)
>
> Myc
>
>
> --- Steve <alienrelics@...> wrote:
>
> > --- In Homebrew_PCBs@yahoogroups.com, William Carr
> > <Jkirk3279@> wrote:
> >
> > > I don't know if it's a practical suggestion, but
> > there are compounds
> > > now used for emergency bandages.
> > >
> > > You slap one of these on a fast-bleeding wound,
> > and the chemical
> > > additive absorbs the blood instantly, giving off
> > some heat.
> > >
> > > This causes the wound to clot immediately.
> >
> > I doubt it. I suspect that what you are talking
> > about is a clotting
> > agent, not a drying agent.
> >
> > Steve Greenfield
> >
> >
> >
> >
>
>
> __________________________________________________
> Do You Yahoo!?
> Tired of spam? Yahoo! Mail has the best spam protection around
> http://mail.yahoo.com
>