If you know somebody who is allergic to wool - and they are willing - they
could hold it and see if it triggers a reaction.
Otherwise, microscope. You can buy pretty good microscopes these days,
including some that plug into a computer via USB so you can capture images.
Wool is scaly like hair, synthetic fibres are smooth.

Message: 1
Date: Thu, 18 Aug 2016 16:46:35 +1000
From: Elizabeth Jones <elizabethrjones2...@gmail.com>

Hi everyone,
This is not directly historical but I knew this list would be my best chance
of an answer.
My uncle sent my 2 month old son a gift of a hand knitted cardigan which he
bought from a charity stall. without a label I have no way to know if they
have used wool or acrylic yarn.
I know I can test using bleach or a burn test but I don't want to damage the
garment is there a non destructive test I can do on a finished garment?

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