Learn the truth about COE and it's limitations in calculating compatability between glasses! 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. From it you can learn how to build a glory hole, an annealer, batch your own glass, master sand casting, kiln casting, and find out 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!