Teen this quilt is made of several bits of fabric I have "inherited"..just bits of this and that with no selvage information, most are quilt shop quality fabrics. I will take a pic of the offending fabric when I get a chance. Coincidentally I threw the strips into a glass jar of tap water last night. it looks like a deep red punch right now! I think Moda fabrics do a good job of safe reds. Fabrics that I purchase are all prewashed and dried.
I should explain that I was pressing the finished strip sashing and spritzed it with water to get a crisper press...that's when the color migration began.