Northstar's Blue Thunder boro is a dark cobalt blue color with silver. When worked in an oxidizing flame NS-122 Blue Thunder yields bright metallic blues. When worked in a neutral flame it yields bright hazy greens. When worked in a heavily reducing flame NS-122 Blue Thunder produces a nice ash gray. It is well suited for stringer application, blown work, and sculpture. NS-122 Blue Thunder is a lighter version of NS-45 Blue Moon with the same working values.