I have a can of this
http://www.gcctech.com.au/products/spray/index.htmlWorks well on my HP4000 series laserjet.
Can't comment on other printers.
--- In Homebrew_PCBs@yahoogroups.com, "Boman33" <boman33@...> wrote:
>
> I saw an ad for a Chinese company marketing a device & liquid that a
> transparency could be put through and it would come out with very high
> contrast, opaque blacks. I do not know what the liquid was.
>
> Bertho
>
>
>
> From tda7000 Sent: Wednesday, February 22, 2012 15:45
>
>
>
> --- In Homebrew_PCBs@yahoogroups.com
> <mailto:Homebrew_PCBs%40yahoogroups.com> , "John Anhalt" <janhalt@>
> wrote:
> >
> > I use a HP4101 printer and the transparencies are also speckled. I go over
> them completely with a black, dry erase marker (Expo brand) on the toner
> side. Let them dry, they wipe off with soft tissue like Kleenex. The black
> pigment is retained only in the speckles.
> >
> > I wrote a more detailed procedure a few months ago, but that is the gist
> of it.
> >
> > John
>
> I just dug up an old whiteboard marker and gave this a shot... and it worked
> quite well!
>
> Before, the toner was very easy to see light through, now it's very black.
>
> Funny thing was, the marker was almost empty and wasn't really even giving
> out black ink. Yet it still caused the toner to darken... I see these things
> smell pretty strongly so I am guessing something other than the black ink
> may be responsible for causing some kind of reaction with the toner.
>
> I also noticed that rubbing too much made holes in the toner. I wonder if
> you could extract the ink and spray it on the toner instead, causing the
> effect but without having to physically push on the image?
>
>
>
> [Non-text portions of this message have been removed]
>