Fire and Glass. The combination brings beauty, warmth, and a special ambiance to your fireplace or fire pit table. Available in multiple colors and sizes, fire glass gives you limitless opportunities to match your furnishings and decor indoors or out. Fire glass also offers an energy efficient, affordable "go green" solution to burning logs and is more attractive and decorative than lava rocks or lava logs.Fire glass provides a delightful and versatile combination and the variety of choices give customers creative ownership of design. Fire glass does not discolor if used with clean burning propane or natural gas. If your fire pit table does not burn clean, you can purchase an air mixer that will address this concern. We suggest checking with the fire pit manufacturer to see if their product is made for the fire glass.