Northstar Steel Wool boro glass is a unique addition to the borosilicate color palette. It is a funky, bumpy color rod that turns smooth when melted. It has tons of sparkle and can be mixed with any color to add a sparkly shimmer to any piece. NS-129 Steel Wool can be used in all applications with no cracking issues but use caution in deep encasement. We recommend using a neutral/oxidizing flame for NS-129 Steel Wool. Use in the back of the flame and try a reducing flame to cut down on boiling. Try mixing NS-20 Dark Cobalt with NS-129 Steel Wool to get a very nice blue sparkle. A little hand mixing of NS-129 Steel Wool will give you the color you desire.