How can I tell if my Jadeite kitchenware is real or a reproduction?

Jadeite is opaque green glass kitchenware, made in large quantities in the mid-twentieth century by companies such as Anchor Hocking under its Fire-King line, and also by McKee and Jeannette. Its popularity has led to many reproductions and new pieces, so careful identification matters.

Start with the mark. Many genuine Fire-King pieces have an embossed or impressed Fire-King mark on the base, though some originals were unmarked or had paper labels. Compare the color to known originals; genuine Jadeite has a particular soft green color, while many reproductions are a different shade, more uniform, or have a slightly different glow. Reproductions are often heavier or thicker, with sharper edges or less crisp details. Look for normal wear on the base and rim.

Pattern and shape are also clues. Genuine pieces came in known patterns and forms, such as Restaurantware, Jane Ray and Swirl. If a shape was never made in Jadeite, it is likely new. Avoid relying on blacklight tests alone. If you are unsure, a dealer who specializes in vintage kitchen glass can usually identify originals quickly.