When tested with an XRF instrument this 3-Quart Corning Ware casserole dish had the following reading set (reading was taken on the painted floral pattern on the exterior of the dish):
- Lead (Pb): 29,700 +/- 800 ppm
- Cadmium (Cd): 602 +/- 36 ppm
- Mercury (Hg): Non-Detect (ND)
- Barium (Ba): Non-Detect (ND)
- Chromium (Cr): Non-Detect (ND)
- Antimony (Sb): 95 +/- 31 ppm
- Selenium (Se): Non-Detect (ND)
- Bromine (Br): 106 +/- 12 ppm
The plain white interior of the dish (and of other dishes like this) is consistently negative for Lead and Cadmium.
There was no regulatory standard in place for total lead content in decorative elements in cookware like this at the time it was manufactured (especially total lead content as detectable with an XRF instrument.)
For context, the amount of lead that is considered unsafe in a newly manufactured item made today and intended to be used by children is anything that is positive for 90 ppm Lead or higher in the paint or coating. Again this piece is positive for Lead at 29,700 ppm.
While these vintage casserole dishes have never been studied to determine whether or not they are possibly poisoning the user (or at least whether or not they are possibly contributing to background blood Lead levels for people who cook food in these vessels) they have also not been studied to confirm they are safe. With the levels of Lead being this high, I would never use one of these in my home. I would especially not use something like this for food-preparation purposes.
As always, please let me know if you have any questions.
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