Teal Unscented Crystals one year supply reuseable; add fragrant oil, stir to activate color, refresh with any scent fragrant oil, color will fade over time.
Unscented Crystals to be used with Fragrant Oils. Slows down the heat process so the Fragrant Oil does not burn, it is warmed. (no brown spot in the bottom of your dish) or if you use water with your Fragrant Oils, you no longer have to think "did the water evaporate?". Crystals are reusable for approximately 4 months AND you can change your Fragrance each time you use it without changing Crystals!