I will not use any fabric in a quilt without washing unless I have tested it for bleeding first in straight hot water. Made a baby quilt for great grandson with 3” blocks. The center of the blocks were prints and the outside edges white. The blocks formed diamonds of color with a white zigzag between the vertical rows. I press and starch seams as I go. When I looked at some completed rows color had bled into white. Colorful words were spoken and some unsewing took place. Used to prewash everything but everyone kept saying “you don’t have to wash the new fabrics. Learned my lesson Trust but verify.