Quote Originally Posted by paul_c5x4 View Post
Thin glass is also difficult to find - One good source is large microscope slides, for example: BRL large tissue slides
I have a few sheets of 1.5mm (approx) in 10"x8" they came from a pile of picture frames that had belonged to my old next door neighbour, it's not legal in the EU to sell less than 2mm thick glass direct to the public.

My other source is old glass plates, I have a few boxes of unused plates (some sealed but mostly useless) and occasionally when I buy plate holders they come with plates still inside. In fact I took a number out of holders yesterday all fitted in the wrong way so they'll be stripped and cleaned.