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Vintage (1970s?) cereal bowl: 134,100 ppm lead (yikes!) when tested with an XRF instrument.
For context: when testing is done with an XRF instrument, the amount of lead that is considered toxic in a newly manufactured item made today and intended for use by children is anything 90 ppm Lead or higher in the glaze or coating and anything 100 ppm Lead or higher in the substrate. High Lead levels found in a piece like this are generally the levels of Lead found in the glaze (the coating), not the substrate (the clay.)
There is currently no comparable regulatory action level or limit for XRF detectable levels of lead found in dishware (vintage or new.)
To learn more about XRF Testing, Click Here.
To learn more about why lead in vintage dishware may be a concern, please Click Here.
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