This vintage Pyrex food storage container (which I bought on eBay for my book and my #MuseumOfLead collection) was positive for lead at some of the highest levels I have ever found. It’s super interesting to note how the red is fairly solid with few blemishes and little wear, much like it would have been when new. I have posted other examples of this very same dish (in different colors) that clearly show how the paint wears over time. And where does that lead paint end up? In your kitchen environment? In your sink? In your dishwasher? No one has studied the impact of this sort of source of lead, so there is not an answer to that. As a result, I subscribe to the #FirstDoNoHarm principle and also #BetterSafeThanSorry, and I do not have any leaded vintage Pyrex pieces in my home. [The clear-glass vintage Pyrex pieces are often lead-free.]
The XRF readings for this piece came in as the following levels:
Milk Glass (the white part):
Lead (Pb) – 1212 +/- 70 ppm,
Cadmium (Cd) – 26 +/- 11 ppm.
The red painted part (tested from the outside):
Lead (Pb) – 310,900 +/- 30K ppm
Arsenic (As) – 14,200 +/- 2,200 ppm
Cadmium (Cd) – 33,200 +/- 3,300 ppm
Again, for context – the amount of lead that is considered toxic in an item manufactured for use by children is 90 ppm lead and higher in the glaze/paint/coating. There is no standard limiting the XRF detectable amount of lead in cookware, and this especially applies to vintage cookware pieces. That said I consider anything under 90 ppm “Lead Safe” and anything over 90 ppm lead a problem. 310,000 ppm lead is a DEFINITE problem, especially for a functional piece meant to be used for food preparation and storage.
As always, if you have any questions please let me know!