Germany · Metallurgy; Precious metal refining; Hessian heritage

Frankfurt Gold and Silver Refining

Frankfurter Edelmetallscheidung — Probierkunst

The precious metal refining tradition of Frankfurt — the German financial capital whose gold and silver trade (and later the Degussa/Umicore refinery) made it a significant node in the European precious metal economy. The Frankfurt Probierer reads the correct gold purity after refining through a touchstone-and-acid test — the oldest and most widespread precious metal quality assessment documented in the CRAFT archive, dating from antiquity and still used by traditional goldsmiths and refiners as a rapid in-field assessment.

Risk level: Vulnerable · Not listed

Alternate Names
Edelmetallscheidung; Scheideanstalt; Probierer; Feingold; Frankfurt Goldraffination
Geographic Center
Frankfurt am Main, Hesse — the historic Frankfurt precious metal trading and assaying community
Community / Ethnic Group
Frankfurter / Hessisch
Estimated Origin
Medieval (Frankfurt's role as a precious metal trading center documented from the medieval period alongside the Frankfurt Trade Fair; the touchstone assessment ancient, with documented use from ancient Greece and documented in German assaying practice from the 14th century)
Cultural Function
Frankfurt's position as Germany's financial capital was partly built on its precious metal trading and assaying heritage — the ability to accurately assess gold purity was as foundational to the Frankfurt trade fairs as the banking instruments of the Fuggers and Rothschilds; the touchstone test is the most democratic of all quality assessments, requiring only a piece of fine-grained Lydian stone and a drop of acid
Primary Materials
Refined gold or silver (the assessment objects); Lydian stone or fine-grained touchstone (Probierstein — the basalt or Lydian stone on which the test streak is rubbed); acid solution (for the color comparison)
Primary Tools
Lydian stone touchstone; nitric acid or aqua regia; reference Probiiernadeln; the eye (for the 5-second acid reaction color comparison)
Process Overview
Touchstone surface cleaned; test gold and reference needle streaks rubbed on stone; acid applied to all streaks; 5-second color comparison; purity judgment made
Traditional Applications
Rapid in-field gold and silver purity assessment (primary from antiquity)
Contemporary Applications
Workshop-level purity assessment for purchasing and trade (primary current use, despite XRF being more accurate for formal transactions)
Notable Practitioners
Frankfurt precious metal dealers and assayers; German goldsmiths trained at the Goldschmiedeschulen; approximately thousands of practitioners across Germany (a very widely transmitted basic skill)
Key References
Frankfurter Probierkunst (Frankfurt Chamber of Commerce; German assaying history literature; Goldschmiedeschule Schwäbisch Gmünd)
Verification Status
Verified

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