Instructions
Check that an potential carnival glass piece is genuine by ascertaining how it was made. Carnival glass was press-molded -- the shapes stamped out under high pressure in a speedy mechanized process. On press-molded glass, none of the details are sharp-edged because they haven't been worked by hand, while the base typically has a curled rim.
Look next for an iridescent, oily sheen. This is the key feature of carnival glass. Without it, the item is probably another form of press-molded glassware, like depression or uranium glass.
Find prices by typing "carnival glass" into your search engine. There is no shortage of sites specializing in carnival glass, whether buying and selling or simply gathering information. Use the sites' own search engines to find examples similar to your own. Items of carnival glass are usually described according to their shape (vases, bowls, novelties) and color (marigold, amethyst, green.)
Find more prices by visiting online auction sites. Go to their carnival glass subcategories and type a description like "amethyst bowl" into the auction's search engine to bring up a list of current lots. Use the site's tracking tool to follow some of these lots through to their conclusion. This will give you a realistic and up-to-date price for a particular piece of carnival glass.