Reason for washing BEFORE using - I just bought 2 different mfg. red-burgundy fabrics at 2 different shops. I was told years ago by a college level quilting teacher to WASH fabric before use. I sure am glad I took that advice! Both of these fabrics turned the sink water dark PINK ! Had I been doing a 2 color quilt, one color WHITE, I certainly would have had a mess on my hands. I don't like the "HAND" on fabrics with lots of sizing etc. ! I think this dead horse has been beat enough, so, wash or don't wash - the choice is YOURS!! SEW ON !!