William Chops Westfield wrote:
>
> nitrocellulose is somewhat soluble in isopropyl alcohol.  Common stuff,
> over here (think NC laquer rather than gunpowder.  Or "nail polish")
>
> Another possibility is some of the micro-fine powdered polyethylene (again,
> used in the cosmetic industry.)  I probably wouldn't work quite by itself,
> by you could probably put it in a water/alcohol carrier and then bake it
> on to fuse it to the copper.  (rather similar to laser printer toner in that
> respect.)   For that matter, I wonder what's in those opaque-ink "gel" pens
> that are appearing all over (these have a light-colored base that works on
> black paper, but they're fluid enough to work in more-or-less standard
> ballpoint mechanisms...)


Thanks BillW, good ideas. Really anything soluble
in alcohol that dries to a waterproof layer should
work, as a decent etch resist anyway. Making sure
it prints well in a bubblejet head and doesn't gum
up the head when not is use is a fraction harder.

I tested some bubblejet ink on a few surfaces, one
thing I did note is that it is VERY slow drying,
and doesn't quite dry at all unless it soaks into
paper which seems to dry it. I'm guessing this is to
avoid drying in the head and gunging it up.

I think that shellac might be usable, it is organic
and non toxic, dissolves totally in alcohol and can
be diluted to the right viscosity. I'll buy a
paint viscosity measure and some bubblejet refil
ink and get a viscosity reading unless someone has
more accurate equipment. :o)
-Roman

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