I inherited yards and yards of fabric, i know by the patterns, that some of these are 30, 40 years old, maybe more. most have been stored in tightly wrapped plastic for the past 10 years. I even have fabric that someone told me was printed feed sack fabric. My question is- Is this fabric going to hold up in making quilts? How do I tell if it's got dry rot. They are the most beautiful fabrics. They don't make cotton fabrics the way they used to. These are much thicker, sturdier than the ones we buy today. Thanks for all your help.