I may be late to the party with this, but I've just stumbled on a product called 'Glass Clay' or to give it's proper brand name 'GlasClay' produced by ClayMania.
GlasClay consists of fine particles of glass suspended in a water-soluble binder, you buy it as a powder and reconstitute it with water, you then work it like clay, shape it, cut and/or texture it, leave it to dry and then fire it in a kiln... the result is a piece of glass! It comes in different colours based on the glasses of Bullseye and Oruboros all of which are COE90. More details can be found here.
Could be quite interesting for those wanting to create more 3-dimensional work in glass.
Has anyone seen/used this product yet?
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