How do I tell old carnival glass from new reproductions?

Carnival glass has been reproduced and reissued for decades, so caution is wise. Old carnival glass from the early twentieth century usually shows wear on the high points and base, has a softer, more layered iridescence, and often has a ground or polished base. Many reproductions have a harsh, overly shiny or rainbow-oil look and sharp, unworn edges.

Marks can help but can also mislead. Some later makers molded their own logos into reproductions, while some fakes carry copied marks of old makers such as Northwood. Learn the genuine mark for the maker you suspect and compare its size, shape and placement with a reliable reference. Check the base color by holding the piece to a light; certain colors were not used in the original production of some patterns.

Pattern details matter too. Reproductions made from new molds often have softer or slightly different designs than the originals. If you are unsure, take the piece to a dealer or appraiser who handles early American glass. They can usually tell old from new within a few minutes by handling it.