California's Proposition 65 requires clear and reasonable warnings before exposing Californians to listed chemicals, with penalties up to 2,500 dollars per violation per day and enforcement driven substantially by private plaintiffs. The chemical list, maintained by California's OEHHA at oehha.ca.gov, exceeds 900 substances. For brands selling nationally, the operational problem is geographic: one pack, one label, fifty states, one of which wants a warning the other forty-nine do not.
What the QR code changes, and what it does not
It does not change your on-label obligations: safe-harbor label formats are their own compliance question, settled with counsel. What the code changes is everything after the label. The same Digital Link QR your pack carries for Sunrise 2027 can serve the full warning, with the chemical named and the P65Warnings.ca.gov reference, to scans from California, while a scan of the identical pack in Texas or Toronto sees the ordinary product page. One printed artwork, jurisdiction-correct behaviour, because the resolver knows where each scan comes from.
Why brands actually do this
Space. Small labels cannot fit every market's disclosures. Moving the long-form warning behind the code frees artwork while keeping the disclosure a single tap away.
Change velocity. The OEHHA list and safe-harbor rules evolve. Text behind the code updates in minutes; text on film updates at the next print run.
Evidence. A resolver's scan records show the warning was served to California scans, a useful artifact in a dispute-heavy enforcement environment.
Setting it up on Onpack
The console has a Prop 65 field per product, including an insert button carrying the statutory long-form safe-harbor wording with the chemical name left for you to complete, because inventing legal text is not a software feature. Fill it, save, and California scans see the warning automatically, in the same mechanism that shows EU scans passport data. The pattern generalizes: compliance content is jurisdictional, packs are global, and the resolver is where the two reconcile, the same story told in per-country destinations.
Common questions
Does a QR code satisfy Prop 65 labelling on its own?
No. Prop 65 safe-harbor warnings have specific on-label requirements. The QR route complements the label: the same code your pack already carries can show the full warning to California scans.
Which products need Prop 65 warnings?
Products exposing Californians to listed chemicals above safe-harbor levels; the list exceeds 900 substances, maintained by California's OEHHA. Whether your product triggers it is a chemistry and legal question.
What is the safe-harbor warning wording?
OEHHA publishes prescribed formats naming at least one listed chemical and the P65Warnings.ca.gov site. Use the statutory wording verbatim; it is not text to paraphrase.
Can the warning show only to California users?
Yes, that is exactly what a jurisdiction-aware resolver does: scans geolocated to California see the warning, scans elsewhere see the ordinary page. On-pack labelling requirements remain whatever they are.