I was just wondering if any of you buy glitter at a local craft store that will work in soft plastics. I do not want to buy just 1 or 2 colors at a time on line and pay outrageous shipping if I can pick some up at the store while I am alredy in town. The glitter I have does not tell what kind of glitter it is or what it is composed of so that I can tell what might work. Should I do a trial and error? How do I know if it is metal based? I would not want it to be metal and blow up the microwave. Any suggestions