SW-180 Desert DuskCone 6: Desert Dusk is a warm amber matte glaze with crystals that melt into a glossy purple and blue. Heavier crystal application will produce more color variation. Cone 10: Glossy purple blue is more prominent. Increased movement. TIP: SW 173 Amber Quartz is the base glaze. For a lighter crystal effect, you may try applying two coats of SW 173 Amber Quartz with a third coat of SW 180 Desert Dusk. Wood and soda firing results will vary.