Vintage Pyrex mugs/ tea cups in the “Old Town Blue” pattern: The dark blue paint on these mugs tested positive for the following elements at the following levels (with a one-minute test, using an XRF instrument):
Lead (Pb): 17,700 +/- 500 ppm
Cadmium (Cd): 154 +/- 12 ppm
Arsenic (As): ND
Mercury (Hg): ND
Platinum (Pt): 1,018 +/- 161 ppm
Gold (Au): ND
For Context: The amount of lead that is considered toxic to children in a newly manufactured item intended specifically for use by children is anything 90 ppm and higher (in the coating.) Vintage dishware is not regulated at all for “total lead content as detectable with an XRF” and neither is modern dishware (yet.) [Isn’t it interesting that it was positive for platinum!] NOTE: When well used, these vintage Pyrex pieces will also usually test positive with a reactive agent test (like a LeadCheck swab: http://amzn.to/2DfE3ERaffiliate link*).
Take away: if you can AVOID having vintage Pyrex (or any vintage mugs or glasses) in your home, I would highly recommend that.
As always, please let me know if you have any questions at all.
*Amazon links are affiliate links. If you purchase something after clicking on one of my links I may receive a small percentage of what you spend at no extra cost to you. Thank you for supporting my advocacy work in this way.