Storing fabric
I am cutting donated fabric to make quilt kits for Childrens' Hospital. Many pieces in this batch have faded lines, I'm assuming from how it was stored. It's taking me much longer to cut this, since I have to cut around the faded areas, and I'm losing some fabric.
Do you think these fade marks are from sun exposure, or can any light exposure do this? It's pretty obvious it's from how it was folded, based on where the lines are. (Folded in 4ths lengthwise, and then in 3rds across the width.)
Thanks