American Fire Glass AFF-COBLRF12-10-J 1/2" Cobalt Reflective Fire Glass 10lb Jar. Deep cobalt blue, with its intense electrifying hue, is not a color for the weak of heart. It communicates daring, strength and confidence. When your customers add our 1/2” cobalt reflective fire glass to their fireplace or fire pit, they will not only be setting up an exciting fire glass display worth remembering, but also making a bold statement about their personality. Our cobalt reflective fire glass is not only a stylish and beautiful addition to any indoor fireplace, but also a dazzling accent to any outdoor fire pit. When unlit, the cobalt color is a rich, electrifying blue, but once set aflame, the gas flames rise up through the blue, transforming it into a brilliant royal purple. The reflective property of the fire glass further enhances the resplendent display, quickly becoming the focus of all attention.