The difference is what size the glitter particle has been cut. Standard glitter powder size is .008″ hex, were as glitter dust size is .004″ hex or smaller. Glitter is made by finely cutting sheets of plastic or metallic foils into minute pieces. These tiny flecks of plastic or foil reflect light brilliantly as it shines off of myriad surfaces. Most glitter websites would refer glitter dust as extra fine glitter powder.
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http://www.glitties.com/glitter-dust.html
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