DLGlos writes:


[...]

Others have offered some good advice.

Lexan has a grayish/blue cast when looked at from the edge. Clear
acrylic is generally water clear to very, very sligthly warm amber
tinged when looked at the same way. If your have a piece of each, the
difference is obvious, otherwise, perhaps not.

A blueish tint on the edge can also be seen in polyethylene or
plyvinyltoulouene (which is probably carcinogene), but these are very
rare to start with. Where was the piece in question picked up?

--
Dr. Juergen Hannappel http://lisa2.physik.uni-bonn.de/~hannappe
Phone: +49 228 73 2447 FAX ... 7869
Physikalisches Institut der Uni Bonn Nussallee 12, D-53115 Bonn, Germany
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