Homebrew PCBs

You wrote:
>So I guess you are saying that my laser printed PCB patterns (on
>plastic sheets) are positive as is, and I have my terminolgy
>backwards. So I can use these with "negative acting screen printing
>emulsions" to get the silk screens I need to put resist ink on the
>copper which is not to be etched?

Where can I get "negative acting screen printing
emulsions"?

TIA,

Javier.