XRF readings:
Lead: 69900 ppm · Cadmium: 69900 ppm · Arsenic: 0 ppm
Verdict: Extreme: do not use + High cadmium
This Green Pattern Franciscan Potteries Vintage Ceramic Plate: 69,900 ppm Lead + 86 ppm Cadmium tested at 69900 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. Cadmium reads 69900 ppm, which is also flagged territory.
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).