I don't always wash my fabric but did learn after a black and white quilt with red borders did run into the white. That was before I heard about color catchers.
I've noticed too that after a long day of sewing or cutting I end up with an asthma attack and have had to use my nebulizer or albuterol. It's not too fun when you can breathe. I hate to prewash because of the fraying but know that I should so I don't get so sick. Does anyone know if the fray stop works when you wash or how do you keep it from fraying so bad.