pumeco:
"For a shadow to be pure black, it would need to be cast upon a pure black surface by a source of ligh emmitting NO light whatsoever!"

Len, absolute rubbish. Cheap vodka has rotted your brain. You should drink cask strength, single malt whisky if you wish to think clearly. ;-)

(This is much more fun than finishing setting up on a new hard disk which is my other task for the day)