AMACO PC-63 Cosmic Tea DustPotter's Choice 63 Cosmic Tea Dust Cosmic Tea Dust is a sparkly, dark brown glaze, which breaks a light yellow brown over texture. The sparkle shifts subtly from silver to copper to give the glaze an iridescent quality. Due to the powdered nature of the materials involved with the dry mix dipping buckets of this product, their respective health information and labels differ from the brushing glazes.