On Fri, 26 Feb 2010 22:41:10 -0700, you wrote:

>
>Mike Harrison wrote:
>> check out my page www.electricstuff.co.uk/pcbs.html for lots of info on 
>> making good PCBs.
>
>Why do you use UV? What is the advantage over "normal" light sensitive PCBs?
>

All 'normal' PCB material I've ever encountered is primarily sensitive to UV, to the extent that you
can handle it in normal light for the lengths of time necessary for PCB making. 

I've never actually tried exposing with visible leight but I suspect exposure times would  be pretty
long. 

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