Cut to clear is a technique where a gather of colored glass is lined with a gather of clear glass. Heat melds the two layers together and the shape is formed. After the glass has cooled, the cutter uses copper wheels to cut through the colored glass to show the clear inside.

An example to cut-to-clear.
This technique has been in use for centuries. As you can see, it produces a beautiful hurricane for candles, and creates beautiful glasses and vases as well.
(Photo by the author.)
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