I launder ALL of my fabric - but that's me! I made a quilt for my DGD and didn't launder the fabric, and the red bled onto the other fabrics. After that - I decided that I would wash everything. It took FOREVER and ever, but - I'm (hopefully) caught up. Now, as soon as new fabric arrives, the first thing I do is launder it in warm or hot water and try it. If the fabric is red or black (especially), I'll wash it a couple of times with extra rinses.