XRF readings:
Lead: 2400 ppm · Cadmium: 0 ppm · Arsenic: 0 ppm
Verdict: Elevated: likely lower risk in fired ceramic, test to confirm
This 99 Cent Only Store c. 1999 Blue & White Floral Pattern Ceramic Bowl (No Maker’s Mark): 70,200 +/- 2,400 ppm Lead tested at 2400 ppm lead, significantly elevated. The bioavailability question (can this lead reach a person?) depends on whether the lead is locked into a fired matrix or sitting on a painted surface.
What this XRF reading actually means →
XRF measures lead presence on the surface. It does not measure whether that lead can reach a person. That distinction matters for how you should react to this number. Read the full primer.
Test your own dishes with FluoroSpec →
Source: EverythingLead · Test method: XRF (Niton XL 5 Plus, 1.5 sigma)
License: Verdict and methodology © EverythingLead, CC-BY-SA 4.0. Factual XRF measurements are not copyrightable (Feist v. Rural Tel., 499 U.S. 340).