Vintage Pyrex Clear Glass Double Boiler Cooking Pot.
I tested this with an XRF instrument and below am reporting two sets of readings for this piece.
First is the reading for the vessel of the pot. This is from a two-minute (12o second) reading using an XRF instrument. If a metal is not listed it was not detected.
- Lead (Pb): 216 +/- 14 ppm
- Iron (Fe): 519 +/- 98 ppm
- Vanadium (V): 77 +/- 14 ppm
- Titanium (Ti): 103 +/- 18 ppm
- Zirconium (Zr): 3,315 +/- 64 ppm
- Platinium (Pt): 73 +/- 29 ppm
This is the reading for the handle of the pot:
- Titanium (Ti): 109 +/- 42 ppm
The metal elements are also negative for Lead.
I have personally owned several of these pieces. I bought them all before I knew they were positive for Lead. They were my favorite cooking pieces! Every single piece from this set (cooking pot, double boiler, coffee pot, tea pot) was also positive for Lead at comparable levels to the levels reported here on this post.
Continue reading below image.
With this particular pot pictured here I found it very interesting that the clear glass handle was NEGATIVE for Lead, but every single other area of the glass that was tested was positive for Lead. So making Lead free glass for this item was possible at the time of manufacture, but for some reason Pyrex chose not to do that. That would be an interesting mystery to figure out.
For context: the amount of Lead that is considered toxic in a newly manufactured item intended for use by children is 90 ppm Lead or higher in the paint or coating or 100 ppm Lead or higher in the substrate. Vintage and modern dishware are not regulated in the same way for Lead content detectable with an XRF instrument.
While I am fairly certain no one has done any leach testing on a vintage pot like this (to determine whether or not it is safe for daily use), I decided to stop using these pieces in my home once I found out they were positive for Lead. My educated guess is that at this low level of Lead they are likely not leaching Lead in any detectible levels, but for me it’s still not worth the risk and also not worth spending the money on leach testing.
I generally use stainless steel for boiling water (including for tea and coffee) and for cooking pasta. This is a good inexpensive but durable (and Lead-free) brand (we have a few pieces from this brand in our home): https://amzn.to/2ALS1zJ
As always please let know if you have any questions.
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