I have a newbie question on 100% cotton fabric. I have recently been given some fabrics by a friend and there are some I can feel by touch are 100% cotton. Others feel like cotton but I can't be sure and I might be tempted to use them after prewashing and ironing them. Is this risky?
What are the reasons why all the quilt patterns specify 100% cotton fabric? Are the reasons traditional or because of something bad associated with using a blended fabric?
Will the fabled quilt police come and arrest me if I don't go 100% cotton?