Northstar Lava is a bright intense opaque orange. It is very bright and well suited for stringer application and blown work. It is not terribly sensitive to flame chemistry but stay out of reducing flames. Lava however is heat sensitive so it must be worked carefully to prevent boiling. Encasing with clear is another way of shielding the color, but not necessary. Lava can be easily worked on the surface and will not boil or scar if worked carefully in a soft flame. A nice color effect to try is a layer of Northstar Ruby over Northstar Lava.
CAUTION: AVOID EXPOSURE TO GLASS DUST. ALWAYS USE A DUST MASK AND EXHAUST HOOD WHEN HANDLING FRIT AND POWDERS.