Cone 6: Emerald provides a translucent green gloss color. You will produce beautiful color variations with Emerald 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 changes to red in a heavy reduction. 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 green color but at three coats you will still obtain a translucent fired surface. Four+ coats will produce more opacity and less translucency.