Provenance Record

Clear, well-structured News piece (671 words, within the 400-1200 word range for the category). Overview/What We Know/What We Don't Know/Analysis structure is used correctly; the 'What We Don't Know' section honestly discloses that the underlying PRL paper's abstract page was not directly accessible, which is an appropriate editorial caveat rather than a gap that needed to be papered over.

All 5 source snapshots read in full from sources/2026-07/tulane-researchers-explain-why-gold-never-tarnishes-surface-atoms-self-reconstruct-to-suppress-oxidation-a-billion-fold/ (source-0.html.gz through source-4.html.gz, decompressed and cross-checked against manifest.json sha256 values). source-0 (Tulane press release, news.tulane.edu) confirms the Montemore quote 'People have generally thought gold doesn't tarnish...' verbatim, confirms Biswas as 'postdoctoral fellow' and co-author, the billion-to-trillion suppression factor, the 'trick gold into dissociating oxygen' Montemore quote verbatim, and the vinyl acetate/carbon monoxide/propylene oxide catalysis applications verbatim. source-1 (ScienceDaily) confirms the same Montemore quote, the billion-to-trillion factor, and critically confirms the full journal citation 'Santu Biswas, Matthew M. Montemore... Physical Review Letters, 2026; 136 (20)' -- verifying both researcher names, the volume (136), and issue (20) exactly as cited in the article. source-2 (Scientific American) confirms, character-for-character: the 'zigzagging herringbone pattern' / 'surface reconstruction' terminology, the 'simple, square-shaped atomic lattice into a denser hexagonal shape' description, the pre-reconstruction lower-energy oxidation window, and BOTH direct Biswas quotes ('Everyone knows that gold is difficult to oxidize...' and 'You can prevent reconstruction by putting some absorbent on top of the surface...') verbatim including punctuation. source-3 (Phys.org, fetched via Archive.org fallback per manifest, live URL returned 200 so fallback was informational only) confirms the May 21, 2026 publication date and the billion-to-trillion figure. source-4 (GIGAZINE) confirms the 'very dense pattern' quote and the nanoparticle/square-shaped-regions quote verbatim. No hallucinated quotes or misattributed claims found across any of the 5 sources -- every specific in the article traces to the source it cites.

Every direct quote, the billion-to-trillion suppression figure, both researcher names and titles, the journal name/volume/issue, and the publication date were independently verified against raw snapshot text (not just the automated script's fetch). No fabricated specifics found. The headline's rounding to 'a billion-fold' (vs. the full 'billion to trillion' range given in the body/summary) is a defensible headline compression of the low end of a real, sourced range, not a fabrication.

High-quality, accurately sourced submission. Every quote, name, figure, and citation detail was verified character-for-character against the raw source snapshots. The one automated red flag (a prompt-injection-pattern match in the Scientific American snapshot) was investigated in context, found to be a passive AI-agent notice rather than a manipulation attempt or evidence of altered/fabricated content, and is documented above rather than silently dismissed. Approved without corrections.