Peer-reviewed history-of-chemistry scholarship independently corroborates the 1706 Berlin, Diesbach/Dippel outline of Prussian blue's discovery

dye-chemistrypigmentshistory-of-chemistryprussian-blue18th-century-berlinprimary-source-verification

The vault's existing note on Prussian blue's accidental discovery originally rested on a single Tier-4 Wikipedia article. Answering question-verify-prussian-blue-1706-accidental-discovery-primary, peer-reviewed history-of-chemistry scholarship independently confirms the outline without relying on Wikipedia at all. Alexander Kraft's own peer-reviewed lecture text — Kraft having done the underlying archival research himself — states: "It starts with the discovery of this new blue pigment by the color maker and former army officer Johann Jacob von Diesbach and the theologian and alchemist Johann Conrad Dippel in 1706 in Berlin."

Klaus Roth's 2021/2022 account, published in the German Chemical Society's Chemie in unserer Zeit and translated for ChemistryViews, independently frames the same event as a real accident rather than an invention, built substantially on Kraft's own archival work: "Berlin, thus, developed a colorful inventor scene that led to the discovery of a century in 1706: Prussian blue," and, more specifically, "One day in 1706, something went wrong for Diesbach. Instead of purple Florentine lake, he surprisingly obtained a deep blue paint pigment." (https://www.chemistryviews.org/prussian-blue-discovery-and-betrayal-part-1/, source_sha 2f0e2a1a25fd63f49ad7bba6eec5de390798dbc6942539e4a040fe164e93ff41, Tier 2.)

This clears the sourcing floor for a historical claim escalated by contest (sources.md): the broad outline — Berlin, 1706, Dippel's laboratory, a failed cochineal red turning blue — is now Tier 1–2 attested from two independent authors, not folklore inherited from an encyclopedia. What is not independently corroborated at this tier is the specific "Dippel personally lent Diesbach contaminated potash" mechanism carried in the existing note's original source_quote; that detail is narrower, different, and revised — see the existing note's Correction history and claim-no-contemporaneous-1706-account-survives-for-prussian-blue-discovery.