I always prewash...not just because of bleeding, but remove all the chemicals that are on it, before I go to iron it and they are released into my air...
I wonder if the Asian producers are using poor quality dies now..or if the chemicals they put on the fabric are causing the dyes to leach out!!!
Either way..I hate that our fabric ALL comes from abroad....we have no control over how it is made and what it will do to OUR environment that is for sure!
I cringe when I think of all the FLEECE that is ending up in OUR landfills...being made from polyurethane it is a chemical bomb that will NEVER break down in our landfills...
For testing fabrics in the store...go to WM or your local drugstore and buy a box of alcohol wipes...usually in the diabetic supply area....keep a few in your purse..and if you are unsure...rub some of that alcohol on the fabric selvage...it will pick up dye quick and you will know!