The latest invention from Thomas FX . . . . BIO-ASH (TM) Realistic Biodegradable Volcanic Ash Particles – fully biodegradable, made of food grade ingredients, extremely realistic, comes in coarse and fine; 5 lb box will cover an area of approximately 144 square feet, 1″ deep. This product is ecologically safe, non toxic, non static and fully biodegradable! Call for details. Most common colors are Black and Gray.