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Whoa-wait!!!

Is it clear celluloid?!

DON'T heat it!!! (http://www.oregonknifeclub.org/celluloid.html)

Celluloid, especially the clear 'stuff' is highly suseptible to degradation. Heating...

WELL, you can get them to bend back....however, if it's horn (which it most likely is for that era blade), being similar in material to hair, it has somewhat of a 'memory' and will eventually bend...