XRF readings:
Lead: 161200 ppm · Cadmium: 0 ppm · Arsenic: 0 ppm
Verdict: Extreme: do not use
This Vintage (c. 1950s) Franciscan Apple Earthenware Sugar Bowl: 161,200 ppm Lead. These pieces are *NOT* safe for food use. tested at 161200 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).