Another great invention from Thomas FX . . . . BIO-ASH (TM) Realistic Biodegradable Volcanic Ash Particles – biodegradable, made of food grade ingredients, extremely realistic, comes in coarse, medium, regular and fine; 5 lb box will cover an area of 144 square feet (12’x12’x1″) This product is ecologically safe, non toxic, non static and fully biodegradable! Call for details. From dark grey and black to brown and beige.