"I'd say maybe a Fabric store? Those colors would work but I'm afraid they might bleed a lot during the heating process.".....
I haven't seen many issues with color bleeding in most of the aftermarket glitters I use. In fact they can really broaden the color spectrum. I've had more problems with larger flake glitters not sold specifically for plastic curling when heated. Purple is always a color that can have issues and for that color all I use is the Do-It glitters.
