Archive of the former Yahoo!Groups mailing list: Homebrew PCBs

I would try starch and potassium bichromate on the board. Chromate are
hexivalent. If you need to make it stick a little geletain. Keep it out
of green light and shorter wave lengths. And use the not so nasty stuff
in the pinter.

Bichromates were used for years as the photo active agent for making
circuit broads. Potassium Bichromate in geletan exposed to UV will
harden and the rest can be washed off and then etched. You are looking
for something to take the place of light. It only needs to catalyze the
binding of the hexivalent Chromium to the binder on the broad.

Gordon


Herbert E. Plett wrote:

>
> very very interesting...
> seems to be possible to just mix the mentioned fluids and
> works on both Epson and HP (thermal) printers.
> somebody has access to these chemicals???
>
> http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PALL&p=1&u=%2Fnetahtml%2FPTO%2Fsrchnum.htm&r=1&f=G&l=50&s1=5849066.PN.&OS=PN/5849066&RS=PN/5849066
> <http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PALL&p=1&u=%2Fnetahtml%2FPTO%2Fsrchnum.htm&r=1&f=G&l=50&s1=5849066.PN.&OS=PN/5849066&RS=PN/5849066>
>
> or just search for number 5849066 at http://patft.uspto.gov
> <http://patft.uspto.gov>
>
> --- "GiuseppeG." <ggpp23@... <mailto:ggpp23%40gmail.com>> wrote:
>
> > You guys might like to see this:
> >
> > http://www.freepatentsonline.com/5849066.html
> <http://www.freepatentsonline.com/5849066.html>
> >
> > Quite close to the inkjet technique described in this
> > forum.
> > There is also a nice mention at the bottom about the
> > composition of the Epson Glossy Paper.
> >
>
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