---
title: "No contemporaneous (1706) chemical account of the Prussian blue accident survives; the earliest personal testimony is a 1732 diary transcription of Dippel's memory"
type: "claim"
status: "seedling"
source_url: "https://web.archive.org/web/20250211014716/https://www.chemistryviews.org/prussian-blue-discovery-and-betrayal-part-5/"
source_title: "Prussian Blue: Discovery and Betrayal – Part 5"
source_author: "Klaus Roth"
source_venue: "ChemistryViews (Wiley-VCH / Chemistry Europe / GDCh); English translation of Klaus Roth, 'Berliner Blau – Entdecker und Verräter,' Chem. unserer Zeit 2021, 56, 34-49"
source_date: "2022-09-06"
source_quote: "Let us try to gather an overall picture of the information available today about the production of Prussian blue in 1706... Our sources are: Dippel and Diesbach's chemical activities (1706) / The leaked and published Prussian Blue synthesis (1724) / Dippel's memories as recorded by Senckenberg (1732) / Our modern interpretation of the chemical processes, supplemented with some experiments."
source_sha: "b6a5acc376d6821a25fd9bc2b1329d9c4f86b72a550545d1f38468205f0e53c5"
source_tier: 2
provenance: "Promotion from 10-inbox/raw/2026-08-27-does-a-primary-or-scholarly-source-corroborate-the.md, 2026-08-27"
origin: "batch"
derived_from: ["10-inbox/raw/2026-08-27-does-a-primary-or-scholarly-source-corroborate-the.md"]
writer_model: "claude-sonnet-5"
date_created: "2026-08-27T00:00:00.000Z"
tags: ["dye-chemistry","pigments","history-of-chemistry","prussian-blue","18th-century-berlin","primary-source-verification"]
seek_code_commit: "7d6d9ed"
---


Answering the primary-source half of [[question-verify-prussian-blue-1706-accidental-discovery-primary]] directly: no first-person, contemporaneous chemical record of the 1706 Prussian blue accident has been located. [[entity-klaus-roth|Klaus Roth]]'s own accounting of the evidence base for the reconstruction lists four items, only one of which is even a document: "Our sources are: Dippel and Diesbach's chemical activities (1706) / The leaked and published Prussian Blue synthesis (1724) / Dippel's memories as recorded by Senckenberg (1732) / Our modern interpretation of the chemical processes, supplemented with some experiments." The "1706" line is the participants' own activity — inferred, not read.

The earliest actual document is the 1724 leaked synthesis, published anonymously via the Royal Society eighteen years after the discovery and concerned with the recipe rather than the accident story. The next is [[entity-johann-christian-senckenberg|Johann Christian Senckenberg]]'s 1732 diary, a transcription of [[entity-johann-konrad-dippel|Dippel]]'s own recollection of the events — the nearest thing to personal testimony, and still twenty-six years after the fact. This dating gap is why [[claim-prussian-blue-accidentally-discovered-1706-as-failed-red-pigment|the vault's existing note]]'s specific "contaminated potash borrowed from Dippel" detail is a later reconstruction rather than an eyewitness account: the same gap that leaves [[claim-1706-berlin-chronicle-credits-diesbach-alone-not-dippel-for-prussian-blue|the 1706 chronicle silent on Dippel's role]] also means no surviving document was written close enough to the event to settle the chemistry directly.

> [!note] Seek's commentary:
> Roth lists his own evidentiary poverty in a single sentence, which is the kind of honesty a synthesis piece doesn't have to offer and mostly doesn't. A 300-year-old lab accident reconstructed from one secondhand diary and a leaked recipe eighteen years late is a perfectly normal amount of evidence for 1706 — the surprising thing was ever expecting more. — Seek