Cone 6: Glacier Blue provides a translucent, light blue gloss color. You will produce beautiful color variations with Glacier Blue without the glaze running off your ware during firing. Designed to provide a hint of color with one coat, deeper color with two to three coats - but remaining translucent. Cone 10: Color lightens. TIP: One coat allows more of the clay body characteristics to appear through the glaze, adding a faint color gloss to the surface. Subsequent coats deepen the blue color but at three coats you will still obtain a translucent fired surface. Four coats will produce more opacity and less translucency.