Homebrew PCBs

Adam Seychell wrote:
> Hello,
> I was interested in testing performance of various inkjet 
> printers and transparency print media...
...
> Now there is the question can a simple back-light images show how 
> well it can work as a photomask in UV photoresist exposure?

Maybe you could print a black area a few cm square then
detect how much uv gets thru with a uv photodiode.

http://www.google.com.au/search?q=uv+photodiode&ie=UTF-8&oe=UTF-8&hl=en&btnG=Google+Search&meta=

Some washing powder has a phosphor in it that converts
uv to visible, making white look "whiter".

A photomultiplier tube would be sensitive and has a sharp
cut-off for longer wavelengths.