XRF readings:
Lead: 47200 ppm · Cadmium: 0 ppm · Arsenic: 0 ppm
Verdict: Very high: avoid food contact
This Vintage Crown Trent Staffordshire Made In England Teacup: 47,200 ppm Lead. [90 ppm Lead is unsafe for kids.] tested at 47200 ppm lead, heavily contaminated. If any of the lead is on the painted surface, decoration, or worn area, expect bioavailable exposure with food contact, mouthing, or abrasion.
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).