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.
“If the Lead is only on the OUTSIDE (… of my dish, measuring cup, mixing bowl, etc….) why does it matter?”
Vintage pink Pyrex refrigerator dish: 179,000 ppm Lead (nearly 18%!!!) + 7,003 ppm Cadmium and 12,300 Arsenic!
Vintage clear glass small Pyrex casserole: 866 +/- 61 ppm Arsenic. (This is the first time I have found Arsenic in one of these.)
Vintage Pyrex Spring Blossom Green Crazy Daisy Mixing Bowls: 109,900 ppm Lead (90 is unsafe) + Cadmium too!