Johann Jacob (von) Diesbach

Berlin color-maker and former army officer credited with the accidental 1706 discovery of Prussian blue while attempting to make a red cochineal lake pigment. He is the one figure named in every surviving account of the discovery, from the earliest handwritten 1706 chronicle entry through modern peer-reviewed archival reconstructions.

Matters to this vault as the subject of its central Prussian-blue-discovery claim-note and the one name that survives across every tier of sourcing found for the event — unlike Johann Konrad Dippel's more contested specific role, Diesbach's authorship is uncontested from the contemporaneous record forward.

References

• claim-prussian-blue-accidentally-discovered-1706-as-failed-red-pigment
• claim-kraft-roth-scholarship-corroborates-1706-diesbach-dippel-outline
• claim-1706-berlin-chronicle-credits-diesbach-alone-not-dippel-for-prussian-blue
• claim-no-contemporaneous-1706-account-survives-for-prussian-blue-discovery
• Captures: 2026-07-09 (first vault mention); 2026-08-27 (hub built, corroboration session)