Dear Adele, Check the thread with a high-powered loupe -- you should be able to see 'nodes' in the fibers if it's linen (which would be very exciting given how fine it is). https://lenoklinen.com/blog/linen-fibers-miscroscoping
Also, the following blog post gives some other methods for distinguishing linen from cotton: https://mytextilenotes.blogspot.com/2010/02/distinguishing-linen-from-cotton.html#:~:text=Linen HTH. Nancy Connecticut, USA - To unsubscribe send email to majord...@arachne.com containing the line: unsubscribe lace y...@address.here. For help, write to arachne.modera...@gmail.com. Photo site: http://www.flickr.com/photos/lacemaker/sets/