Ok....I have to chime in here. Made many crayon quilts and used bright colors, blacks and reds in all shades. All the blacks and reds were prewashed, the blacks up to five times before they did not bleed anymore. What a mess this would have been if not prewashing the fabrics. When I started my quilting life, I did not prewash any of my fabric. Two quilt disasters later, I prewash all of my fabric now. Just imagine that red or black bleeding all over the yellow and light blue crayons! Please wash that fabric! Hugs! Love crayon quilts!