Forensic Conservation of the Golden Horn Chains
Title: Laboratory Investigations of the Golden Horn Chains-2: Radiography and Magnetic Particle Inspection
Series: Part of the “Forensic Conservation” Research Series (Initiated in 2010)
Abstract
This study represents a landmark application of Forensic Conservation in Turkey, utilizing non-destructive testing (NDT) to decode the structural DNA of the Golden Horn chains. By employing Radiography (X-ray and Gamma-ray) and Magnetic Particle Inspection, the research moves beyond traditional restoration, aiming to educate conservators and museum professionals on the power of industrial imaging in cultural heritage.
Key Technical Insights
Techniques: High-energy Gamma-ray imaging (Co-60) revealed the internal “scars” of the manufacturing process. The findings prove that the links were created by forging iron bars, with the ends heated and overlap-welded in a horizontal direction—a critical detail for understanding medieval ironworking.
The “Stud” Mystery
Radiographic density analysis identified the central cross-bar (stud) as a separate structural addition. This design was strategically used to prevent the chain from kinking (gamba) and to increase its tensile strength under extreme defensive loads.
Invisible Diagnostics: While the links appear stable to the naked eye, radiographic scans detected internal hairline cracks and sub-surface corrosion. This “forensic” look under the surface is vital for long-term preservation planning.
The Absence of Monograms
The lack of any workshop stamps or monograms suggests that these chains were not mass-produced commercial goods but were custom-engineered for a specific, high-stakes military function: the defense of the capital.
Conclusion & Educational Impact
By documenting these advanced imaging protocols, the study serves as a technical bridge between nuclear research (TAEK) and museology. It reinforces the thesis that the chain was not a standalone barrier but a sophisticated component of a larger maritime defense system, preserved as a silent witness to the siege of 1453.
Genç, U., Ekinci, Ş. (2011). “Haliç Zinciri Laboratuvar İncelemeleri-2: Radyografi ve Manyetik Parçacık İle Muayene”, Türk Arkeoloji ve Etnografya Dergisi, 11, 77-86.