XRF readings:
Lead: 3157 ppm · Cadmium: 0 ppm · Arsenic: 496 ppm
Verdict: High: FluoroSpec test required
This y. 2000 Starbucks Coffee “City Mug” Collector Series: 3,157 ppm Lead (>90 is unsafe for kids) + 496 ppm Arsenic too! tested at 3157 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. Arsenic reads 496 ppm, worth noting on top of the lead question.
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).
