We deal in used and vintage sewing machines which is a lot of fun- very frustrating at times, but fun especially the people we are blessed to meet. At times I run across older threads in colors I like.
Somewhere in reasearching one of the machines I ran across the trick to put your old brittle thread outside in a zip lock bag over night and it would be good and strong come morning. Does anyone know or tried this and what do the outdoor conditions have to be to make this work? Thank you