American Fire Glass AFF-BLK12-10-J 1/2" Black Fire Glass 10 lb Jar. Black exudes power, grace and a timelessly formal sense of style. It is a color that is known to absorb all negative energies and give a touch of class to almost any color scheme. When you add black to any presentation, get ready for a sensational display worth remembering. American Fire Glass' 1/2” black fire glass is the perfect choice for both indoor and outdoor fire features. When set alight, the flames seem to dance upon the seemingly wet glass in a display of stunning contrast, immediately becoming the focus of all conversations.