“FDA's ceramic-mug lead rule (CPG Sec. 545.450) mandates keeping decoration off a 20mm zone at the rim/lip of a mug to avoid oral ingestion of decorative components.”

The only 20 mm rim provision present in the sources is section 3 of Canada's Glazed Ceramics and Glassware Regulations (SOR/2016-175), and it does not ban decoration in that zone — it permits exterior decoration within 20 mm of the rim provided the vessel releases no more than 4 mg/L lead and 0.4 mg/L cadmium under the ASTM C927-80 lip-and-rim extraction method, where 20 mm is the depth of extraction solution the rim is submerged in. That is a migration-limit and test-geometry rule, not a keep-off-the-lip decoration mandate, and it is Health Canada's, not FDA's. No text of FDA CPG Sec. 545.450 appears in the source texts, so the attribution to FDA is unsupported here while the substantive mechanism the claim describes is contradicted by the one authority actually provided.