Homebrew PCBs

--- In Homebrew_PCBs@yahoogroups.com, "lanz_24" <lanz_24@y...> wrote:
> Hello!
> 
> Does anyone have an idea what kind of ink is used to make
silkscreen 
> prints on PCB's and how to use them?

Epoxy. Requires mixing two parts (ink and catalyst). Heat cured.
Screened through a tensioned polyester mesh. Photoemulsion is
applied to screen to form image. Emulsion up positive film artwork
is used to make the screen. Lines and text on the final PCB appear
as black lines on a clear background on the film artwork.
Developed screen is blocked everywhere except those areas that were
black on the artwork. Ink is squeeged across the screen to transfer
the image onto the PCB. Basically the screen printing process is
the same as used for textile (t-shirt) printing, but the ink is
tougher when cured and messier to clean-up.