Homebrew PCBs

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?



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