Who makes that product? 0.4mm is a little large for me (I prefer 0.18mm pens) but might be good for other experiments.
As far as conductivity, I'd say lay down a line and measure the resistance end-to-end. That will give you a better idea than I (and probably many others) have. It would be great if you could share that info, too.
TIA,
Donald.
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----- Original Message -----
> From: "David Mitchell" <gossiphog@...>
> To: "Homebrew PCBs" <Homebrew_PCBs@yahoogroups.com>
> Sent: Tuesday, July 26, 2011 11:54:45 AM
> Subject: [Homebrew_PCBs] liquid pencil
> I bought myself one of these new "liquid pencils". It's like a
> retractable
> pen, but draws a nice thin (0.4mm or so) line with this "liquid
> graphite"
> ink.
>
> It erases very nicely, and supposedly becomes permanent after 24
> hours.
>
> I'm wondering if this pencil mark has enough conductivity to allow me to
> plate additional copper on lines drawn on a nonconductive surface like
> fiberglass?
>
> http://web.media.mit.edu/~plusea/?p=554
>