Northstar Jet Black boro glass is a very dense black. It is well suited for sculptural applications and blown work. It is creamy and works easily, making it a welcome addition to the palette of blacks from which to choose. When working NS-125 Jet Black, do so in an oxidizing flame. If worked in a reductive environment it will develop gray streaks on the surface and result in a dull matte finish. When applying the color, do so gently. After it is melted in it can take a lot of heat. NS-125 Jet Black is great in combination with many colors and serves as a background for striking colors.