About Northstar Glassworks

Northstar® Borocolour® is a colored borosilicate-type glass. It is compatible with, and may be
combined with Pyrex®, Kimax®, Duran®, Simax® and any other glass with a similar coefficient
of thermal expansion (C.O.E.) (32 h +2). Glassblowers and lampworkers will be able to achieve
excellent results with Northstar® glass upon the first try. However, Northstar® glass has some
interesting characteristics with which the glass artist may not be familiar. It is our purpose, in this
manual, to explain some of these characteristics so that the glass artist may attain the most exciting
effects possible. Also, some of the following notes will be of more interest to the advanced artist
trying to achieve a particular effect.

Northstar® Borocolour® may be striped, layered, swirled, combed, hobnailed, encased etc. For
interesting effects try covering one color with another (like Yellow over Ruby Red) or encase with
clear glass. Northstar® clear or colored borosilicate frit or powder can be used over Multi or other
colors for exciting variations.