Melting old glass

Jeff its not the melting points that you need to worry about, its the coefficient of expansion (COE). Glass expands when its melted; when glasses are fused under heat they flow together. When the configuration cools, it contracts. If the glasses contract at different rates, stress in the resulting glass piece can be a problem. Its very unlikely that your glasses will be compatible.

You would be better off using a clear adhesive to glue piece to a sheet of clear base glass. On the other hand, you could try making the sheet the way you want and when it cracked along some line or another, then adhere the pieces of the sheet to a base sheet. This is for your use. If you are thinking of selling these things, even if it survives fusing intact, the fused sheet may crack later because of builtin almost critical stress. At a minumum, I would want to put the sheet in a freezer and bring it back to room temp or sunlight heat to check stress before hanging it.

A friend received a bunch of old bottles from an Idaho ghost town. Circa

1880. We separated the glass, clear, green, and bluish. Melted them in a crucible. He made some nice whiskey glasses out of them. It was rather stiff to work with but he pulled it off.

If the OP needs sheets I would suggest he melt the whole batch together and blend it well then roll into sheets.

I think he wants to use the colors as colors separately in a painterly manner, perhaps going so far as to drag the colors out while hot. This is likely not to work, as we have said, but melting them all together would destroy the goal.

thanks for the input all

Jeff