NS-19 Light Cobalt is the least saturated of the four shades of cobalt blue Northstar produces. Because it is the least intense it can be worked in any flame without altering the color. It is not for thin blown work, but it is the ideal overlay color. By encasing opaque colors or saturated striking colors with NS-19 Light Cobalt Blue numerous new effects can be created. Refer to Northstar Newsletter issue 16 for additional information about working cobalt blues.