Lava is an 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 overly reducing flames. Lava is heat sensitive so it must be worked carefully to prevent boiling. Encasing with clear is another method to 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 Ruby over Lava.
Available in Rod, Frit, Fine Frit, Powder Frit & Tube. Cadmium tubes are unencased.
Northstar Glassworks Borocolour Colored Rods & Frit
Northstar Borocolour has a COE of 33 and may be combined with Simax, Northstar and any other glass with a similar coefficient of thermal expansion.
Northstar Glassworks Borocolour Colored Rods are an average length of 18" with a diameter of 5-9 mm diameters. Hand pulled tubes vary in length from 8-22 in. with a diameter of 15-38 mm and wall thickness range of 2-6 mm. Northstar Rods and Tubes are sold by the pound with a 1/4 pound minimum purchase per color.
Northstar Borocolour frits are available in five grain sizes. Large frit is coarse 25 mesh - approximately .055 inches or 1.397 mm. Small frit is finer 38 mesh - approximately .024 inches or .6096 mm. Fine frit is 70 mesh and and powder is 100 mesh. These four frits come packaged in 4 oz. containers. Some colors are available in 16 oz. The fifth product size - called fore powder is between fine and powder in grit size and comes in a 16 oz. container.