Melting Acrylic/Plastic

[cropwell]

With a bit of Internet searching……
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How to tell whether its extruded or cast:
"Burn a piece , extruded burns silently and will drip molten balls , cast burns with a crackly/smokey flame and wont drip. "
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"Another point worth mentioning is that extruded stinks when it's cut but cast has an almost sweet smell."
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And on this forum, from John S in Feb 2013
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"Extruded has white backing on one side and clear on the other.
Cast has clear backing on one side and white on the other."
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Personally, I would only trust John.