When tested with an XRF Instrument the dish pictured here had the following readings (each test is a full minute test result, replicated many times to confirm levels):
#1.) Blue side of food surface glaze
- Lead (Pb): 12 +/- 6 ppm
- Cadmium (Cd): 29 +/- 4 ppm
- Iron (Fe): 1,629 +/- 90 ppm
- Copper (Cu): 389 +/- 26 ppm
- Zinc (Zn): 15 +/- 8 ppm
- Zirconium (Zr): 26,500 +/- 400 ppm
- Barium (Ba): 167 +/- 26 ppm
- Platinum (Pt): 219 +/- 24 ppm
- Non-Detect for: Mercury, Bromine, Chromium
#2.) Yellow/Blue middle of food surface glaze
- Cadmium (Cd): 172 +- 7 ppm
- Iron (Fe): 1,755 +/- 88 ppm
- Copper (Cu): 380 +/- 25 ppm
- Zinc (Zn): 25 +/- 8 ppm
- Zirconium (Zr): 28,100 +/- 400 ppm
- Nb: 213 +/- 11 ppm
- Barium (Ba): 215+/- 26 ppm
- Platinum (Pt): 235 +/- 23 ppm
- Non-Detect for: Lead, Mercury, Bromine, Chromium
#3.) Yellow side of food surface glaze
- Cadmium (Cd): 804 +/- 18 ppm
- Manganese (Mn): 548 +/- 104 ppm
- Iron (Fe): 2,193 +/- 98 ppm
- Copper (Cu): 458 +/- 27 ppm
- Zinc (Zn): 27 +/- 8 ppm
- Zirconium (Zr): 23,200 +/- 300 ppm
- Barium (Ba): 217 +/- 25 ppm
- Platinum (Pt): 241 +/- 24 ppm
- Non-Detect for: Lead, Mercury, Bromine, Chromium
#4.) Back of dish – unglazed brown ceramic
Logo area on back of dish tested similarly
- Lead (Pb): 35 +/- 4 ppm
- Manganese (Mn): 10,900 +/- 200 ppm
- Iron (Fe): 63,600 +/- 600 ppm
- Nickel (Ni): 55 +/- 25 ppm
- Copper (Cu): 15 +/- 10 ppm
- Zinc (Zn): 38 +/- 6 ppm
- Titanium (Ti): 7,299 +/- 421 ppm
- Zirconium (Zr): 287 +/- 6 ppm
- Barium (Ba): 190 +/- 14 ppm
- Platinum (Pt): 54 +/- 13 ppm
- Non-Detect for: Cadmium, Mercury, Bromine, Chromium
Are these old plates from jono Pandolfi? There site says lead free and Cadmium free certified
Their “certifications” are likely based on leach testing done when the item is in new condition. You can read more about that (generally) here:
https://tamararubin.com/2019/12/does-vintage-and-new-functional-pottery-and-dishware-have-unsafe-levels-of-lead-why-is-that-a-problem/
Tamara