This all depends. Cobalt was one of the first colors and is made by Northstar and Glass Alchemy. But China does also make it. Many blowers will use the China tubing to put colors over it like dichro. It is affordable and the only tube on the market.
This all depends. Cobalt was one of the first colors and is made by Northstar and Glass Alchemy. But China does also make it. Many blowers will use the China tubing to put colors over it like dichro. It is affordable and the only tube on the market.