Cone 6: Olive Float is a dark green gloss glaze that contains a light green crystal. It is a dazzling glaze that mimics crystalline glazes without the fuss of complicated kiln programing! Cone 10: Color changes to red. Crystals remain. TIP: SW-210 Emerald is the base glaze. For a lighter crystal effect, you may try applying two coats of SW-210 Emerald with a third coat of SW-151 Olive Float.