The Northstar Glass coloured borosilicate palette boasts an exciting, dynamic selection of colour. The colour is made by skilled artisans in relatively small batches. Northstar boro is simple to combine with masses of colour, can be directly inserted into the working flame without preheating, and most forms made from boro require very short annealing times.
Perhaps the most exciting aspect is that the colours themselves can be changed by the way they are worked and annealed.

COE 33

Annealing Temperature: MAX. 1112 F (600 C) Suggested Annealing Temperature: 1050 F (565 C)