| ▲ | throw0101a 9 hours ago | |
A recent video from the I Want To Cook channel on the topic: * https://www.youtube.com/watch?v=2DKasz4xFC0 He references this FAQ from the Corning Museum of Glass (CMOG): > The short answer is that the change from upper to lower case signified a re-branding of the trademark Pyrex® in the late 1970s but is not a conclusive way to determine, historically, what type of glass formulation the product is made from. | ||