Cone 6: Blue Opal is a medium blue semi-transparent to fully opaque gloss glaze. Thinner applications create a transparent blue haze; thicker coatings produce an opaque finish. Surface textures can cause the glaze to collect and produce streaks of greyish blue. Cone 10: Becomes more transparent. Can produce red mottling in a heavy reduction. TIP: Light applications on brown and buff bodies will produce a transparent green-blue gloss finish. Thinner application will provide a glossy transparent finish. Thicker application will provide light blue floating. Surface decoration will be visible under the glaze, but if you apply the glaze thick, it could blur your image.