Unique! BlackJack goes almost clear when hot, but self-strikes back through brown to near-black depending on how thick you use it. BlackJack likes an oxidizing flame, but does not reduce with grey streaks like most black boro colors. In the curls shown here, we had to get the glass right on top of the light to see the brown where it's thinner. BlackJack is not suitable for thin stringer work where you want the stringers to look like a dense black, but it's the perfect colour for very specific things, like sculpting without the greying. Because this glass goes clear when hot then self-strikes, it is useful in applications where, say, you want to mask a weld.
A 250grm pack containing an average of 6 rods.
What is Second Quality?
This glass came out with some flaws from the production process. Typically, this means a few inclusions in the rod or tube, and usually these can be picked out as you work the glass. Luckily for us we don’t have a lot of seconds, but they can be a great deal for the cost-conscious glass worker.