here is a great link that provides some good information about burn testing fabric.
Welcome to the Quilting Board!
Shot--Susan is sitting in crafters' heaven and smiling down at you. It doesn't matter if that ugly (to you) yellow ends up on the backside of a kid's floor quilt, YOU recognized and appreciated HER crafting skill. You did a good thing today. And I think you got a really good deal!!
I tried the burn test on some of the fabrics, and came to a couple of conclusions. One of the fabrics is really dangerous around any flame. WOW. Went up in a second and GONE! Not melted,either, just gone. Burned bright, fast and gone.
And what ever the yellow material, which doesn't seem quite as banana yellow outside, .....well, probably the safest material ever. Cannot get it to burn. Barely can scorch the edge of it. I suspect this is surplus from what Superman made his suits out of, only in yellow. THIS is what you want to make your kids clothes out of...they would be fire proof.
So, will probably still take some to the store, lol, and ask them what some of them are. Darn, I really like that black material with the butter cookie shaped white flowers on it...not for quilts or clothes...but thought it would make something interesting. Do you think that fire retardant stuff really works? I wonder what she was going to use it for, and if she knew it was so flammable?
poly knits would be great backings for charity quilts....will not wear out and wash up great