I was told in a class yrs. ago,(& didn't listen) not to store fabrics in cardboard boxes, on wooden shelves, etc. because something from the wood products would fade/stain the fabrics. Well my husband had just built me some shelves for my fabric storage until I whizzed through it.Hmmmm! So I took some of the YARDS of double-knit polyesters and laid them on top of the shelves & under the stash. It worked! After being warned about heirloom framing & protecting heirlooms/ heirloom sewing, I wasn't taking any chances. Besides, I paid $6.50 for some of the good stuff! star619