PC-11 Blue Spark ^6Blue Spark is a glossy, royal blue glaze which develops small triangular dark gray metallic crystals that make this glaze look like lapis lazuli. This opaque glaze does not break over texture. For best results apply three even brush coats. Glaze may run. 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.