If you are going to use them in an art quilt or wall hanging, go ahead. If you want to use them in a quilt, I would pre-wash in the sink or a mesh bag in the washer. Linen tends to fray more so I would use a larger seam and/or shorter stitch length. If really thin you can use a light weight iron on stabilizer. I have used a lot of fabric samples. Some have a label adhered to the back with fabric content, etc. You can easily remove these by reactivating the glue with a hot iron. I usually start with the paper side and no steam, but you may need to experiment a bit.
Last edited by PaperPrincess; 11-23-2016 at 07:54 AM.