--- In
Homebrew_PCBs@yahoogroups.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?