Learn the truth about COE and it's limitations in calculating compatability! Henry Halem is one of the industry's leading experts on this and other technical subject matter. He's recently released an updated edition of his legendary "Glass Notes,"  the glass studio bible since 1996. In it you can find out how to build a glory hole, an annealer, batch your own glass, learn sand casting, kiln casting, and how to calculate annealing temperatures. He's a wealth of knowledge, and we have an exciting conversation about viscosity, chemistry and compatability.  Succinct and to the point, this episode will explode outworn myths and lead you down a new path!