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World Kitchen, based in Rosemont, Illinois, continues to produce the Pyrex brand today. 4, 2015 photo provided by the Corning Museum of Glass in Corning, N.
Y., a Pyrex measuring cup that was designed in 1993 is shown.
Today, collectors scour yard sales and thrift shops for pieces and patterns, trade online and share pictures.
Production of opalware stopped in 1987 as demand waned.
The cookware was sold as "swift, clean and economical" because it allowed women to bake and serve in the same dish and was easier to clean than traditional pans.
Between 19, designers borrowed from the colors and designs of the times to come up with nearly 150 patterns with names like Snowflake Blue, Butterprint, Spring Blossom and Early American to adorn mugs, mixing bowls, casserole dishes and other pieces.
Pyrex bowls could withstand oven temperatures without cracking and made better use of heat, reducing cooking times and making sure of even cooking.
In the UK Pyrex cookware was available from Harrods as early as 1919.
Top London stores Harrods and Selfridges proudly advertised Pyrex cookware.
In the 50s Pyrex took on a fresh, new, modern look thanks to designers Milner Gray, Kenneth Lamble and John Cochrane.Corning developed it from glass used to make lamp bowls for the US railroad.