I have embroidered for many years and have three plastic cases full of DMC thread - at one time every color they had which was over 300. I have never had any DMC thread run. When I do hand embroidery I do a blanket stitch so I want my stitches to show. I've been making embroideried baby quilts for my grandbabies for over 20 years with no problems. In fact, I thought DMC advertised their thread was colorfast.