Posted 2 years ago
Corning Museum of Glass identified this piece as rare White Pyrex.
I'm from the Corning area and as collectors know, the area is a hotbed for rare Pyrex. My grandfather talks about how Corning Glass helped pull the community through the Great Depression. This is a piece from that era that has been saved and obviously respected and treasured. I found it locally.
Until 1922, all Pyrex had been offered in clear glass only. The CMOG curatorial department sent me this image of an advertisement for White Pyrex, briefly offered to the public that year. This is one of the very first Pyrex pieces that was not clear. White Pyrex would then disappeared for another 14 years.
The Pyrex label is backwards because the molds were meant for clear pieces, which are read by looking through the glass. An opaque bowl needs to be flipped over and appears backwards.
Commonly seen all-white Pyrex is called Opalware. In 1936, Corning merged with MacBeth-Evans, a company known for their opalescent glass. Together they introduced Opalware, a combination of their formulas and efforts However, this rare, original 1920's White Pyrex is purely Corning Glass.