color changing glass is used in a variety of products such as glass vases, oil lamp bases, perfume bottles, containers, smoking accessories, and so forth
ccg (as it's known) is made by small pieces of metal (usually silver and/or gold) that are held in the flame of the torch until vaporized (often called 'fuming')
"color changing glass is used in a variety of products such as glass vases, oil lamp bases, perfume bottles, containers, smoking accessories, and so forth" What is the definition of "color changing glass"?