When tested with an XRF instrument, this “Great White” design white ceramic mug “Made in China” for Pottery Barn had the following readings:
Exterior white glazed surface of the mug:
(XRF instrument cannot fit in the inside of the mug, but glaze is consistent on the interior and exterior so exterior readings should be representative of interior readings)
- Lead (Pb): 130 +/- 12 ppm
- Lead (Pb) reading #2: 120 +/- 11 ppm
- Tin (Sn): 39 +/- 9 ppm
- Zinc (Zn): 67 +/- 13 ppm
- Copper (Cu): 61 +/- 22 ppm
- Iron (Fe): 3,962 +/- 188 ppm
- Bismuth (Bi): 186 +/- 13 ppm
- Vanadium (V): 121 +/- 20 ppm
- Titanium (Ti): 118 +/ 24 ppm
- Platinum (Pt): 52 +/- 26 ppm
- Manganese (Mn): 467 +/- 139 ppm
Black printed logo area on the bottom of the mug:
- Lead (Pb): 113 +/- 13 ppm
- Cadmium (Cd): 11 +/- 5 ppm
- Chromium (Cr): 3,261 +/- 124 ppm
- Zinc (Zn): 60 +/- 15 ppm
- Nickel (Ni): 438 +/- 62 ppm
- Iron (Fe): 4,912 +/- 237 ppm
- Bismuth (Bi): 172 +/- 14 ppm
- Vanadium (V): 123 +/- 25 ppm
- Titanium (Ti): 116 +/ 29 ppm
- Indium (In): 21 +/- 8 ppm
- Cobalt (Co): 1,272 +/- 111 ppm
Tests are science-based and replicable. Each test was done for a minimum of 90 seconds, with a freshly calibrated XRF instrument, and repeated to confirm the levels found. All metals detected by the XRF instrument (testing in Consumer Goods mode) are listed above.
While dishes are not regulated for total Lead content (as detectable with an XRF instrument), a comparable standard to consider in evaluating Lead-safety in dishes is the standards for toys and other items used by children. Those items are considered safe as long as they fall below 90 ppm Lead in the paint, glaze or coating and below 100 ppm in the substrate (in the case of dishes, this would be the underlying ceramic clay). At 130 +/- 12 ppm Lead, this mug is very close to being within the safe range (by those standards, and other similar standards – both European, and American.)
While most would consider these Great White dishes Lead-safe (and they have likely been leach-tested at the time of manufacture) – and I would have no concern drinking out of one of these if I were to visit your home, as a matter of principle, I personally prefer to use completely Lead-free dishes in my home. Here’s my Amazon affiliate link* to the exact dishes I use every day in my home (a style and brand of dishes I have tested repeatedly over the years and found to be Lead-free – in the plain white options only): https://amzn.to/2NwxTJ1 [If you are interested in purchasing the dishes I use in my home, check the prices at Target before purchasing them on Amazon – as Target may have a better price.]
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