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That's an interesting technique, Cynthia. Are the bits of rod and cane set on a thin piece of clear sheet before firing to create the clear spaces around the colors?

Thanks Kittyboy, this is interesting. I have seen suggestions to replace silica flour with alumina hydrate but this is the first time I have seen alumina oxide suggested. Do you have any information comparing the two alumina compounds in terms of their application for glass casting molds - ie. refra...

From your experience, Bert, what is the minimum proportion of mica to paint/enamel to achieve the "not stick to the shelf" result?

Shellac is a unique substance that can react in interesting ways. Starting with a completely clean/new mask model I would spray it with several coats of a good quality lacquer (just the ordinary spray can version from the hardware store), give it adequate time to fully dry and then repeat your mold ...

For those who have used the Patty Gray molds, do they seem to be the usual bisque of slumping molds or a more complex refractory (such as for example the finer, harder material of the Zircar molds)?

What type of fiber board do you use for milling, Rick and where do you source it?