I have learned my lesson to use only 100% cotton fabrics for quilting. I know I can use 50%cotton/50%polyester on occassion or for small small areas, but for cutting squares and tri's...never again! So now I have a bit of a delima. I have alot of fabric....brand name Symphony Broadcloth. It is 50/50. However, I know I have b ought a little bit of 100% cotton too. I have my fabric yardage on hangers in the closet organzied by color.

Question is...how can I tell which is 100% and which is 50/50? I know most will be 50/50 but I know there is some 100 there too. I have tried the pull test with the grain for a stretch..and the stretch means polyester. However, I just bought some 100% from a quilt store online ... and I do that pull test and it is stretchy. Most of what is in my closet is also stretchy..but there are some that aren't! I could go on, but m question is this....
Any idea on how to tell which is 50/50 and which is 100% cotton? I can use the 50/50 for other things (I have 4 grand daughters that love me to make them dresses!) so I am not worried about wasting fabric, but I want to salvage out the 100% cotton pieces for quilting.

Anyone know whether 50/50 is more stretchy than 100% or is it the other way around..or is that even a test at all? The weight of the fabric...some is obviously thinner and that would be the 50/50...but some I think is 100% is stretchy.

Can anyone help me?

PS.. I have found tho, that the 50/50 works really good for binding when you want a 2 inch binding around the quilt. I have used it on all the quilts I have made so far and that little bit of stretch helps alot in fitting the binding around and so far, that has been the easiest and most "Fitting" of all the work I put into the quilt! So I know I can always use it for binding...when in doubt the content!