SW-115 Midnight RainCone 6 oxidation: Midnight Rain is a blue green breaking gloss glaze that contains a black crystal. As the crystal melts and moves, a black oil like streak is created in the glaze. Cone 10 reduction: Crystals melt and integrate into base glaze, darkening the color. Increased movement. TIP: SW 100 Blue Surf is the base glaze. For a lighter crystal effect, you may try applying two coats of SW 100 Blue Surf with a third coat of SW 115 Midnight Rain. Wood