Please stop using vintage Pyrex glassware for cooking & serving food – it’s often painted with high-Lead paint & can test positive for Cadmium & Arsenic, too.
“How much Lead is in my vintage Pyrex?” Here are pictures of each one I’ve tested, with links to test results.
Vintage Pyrex Casserole, “Shenandoah” Pattern c. 1981-1986: Yellow Exterior – 212,000 ppm Lead. 90 ppm is unsafe for kids.