The analysis of metalsby CIRAM authenticates and dates art objectsusing complementary methods, particularly on bronze, gold, silver, iron, and brass.
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Metallography is a structural analysis method that allows observation of the internal organization of metals and alloys. It does not provide absolute dating, but offers key clues about age and manufacturing processes.
By studying microstructures (dendrites, inclusions, metallic grains, etc.), it is possible to determine if an object was cast, forged, or hammered, and if these techniques are consistent with a given era. Coupled with chemical analysis and the study of patina, metallography offers a complete view of the history of a metal object.
At CIRAM, it is part of a rigorous scientific approach to authenticate metal objects.
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The dating of metals is not possible, but CIRAM offers authentication using reliable age tests. For bronze, silver, or brass, we identify the chemical composition of the alloy and detect modernity markers, such as the presence of aluminum, phosphorus, or chromium in bronze, or manganese in iron.
The analysis is completed by a study of patina (corrosion) and internal structure.
Gold and ironrequire a specific methodology, but thanks to our researchers and cutting-edge techniques, we can authenticate and estimate the age of all metallic objects, regardless of the nature of the metal.
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CIRAM uses advanced methods to authenticate and date metal objects:
Our engineers interpret these data to distinguish natural patina and artificial corrosion, determine the age of objects, and provide a reliable authenticity test, particularly for bronze objects.
Request a studyChemical analysis of alloys makes it possible to identify the major and minor elements (copper, tin, zinc, lead, etc.) in order to determine the nature and manufacturing techniques of a metal object.
CIRAM uses scanning electron microscopy (SEM-EDX) to determine this composition and examine the internal structure of the metal. The presence of details such as dendrites or flattened and aligned inclusions reveals the manufacturing techniques (casting, hammering).
If this study is not always enough to prove antiquity, the presence of elements such as aluminum, chromium, phosphorus, or manganese is a formal indicator of modernity, as these components were only intentionally used in alloys from the end of the 19th century.
Corrosion, or patina, reflects the interactions between an object and its environment over time. A copper or silver alloyhundreds of years old will have undergone numerous environmental attacks (humidity, temperature variations, micro-organisms, etc.).
For an ancient bronze, the formation of corrosion products like cuprite, malachite or azuriteis typical. The study aims to analyze the degree of corrosion (deep or superficial).
These elements will lead to the degradation of the metal, the analysis of which can provide clues about the age or modernity of the object. Using electron microscopy, we analyze the depth and composition of the corrosion. An object with a patina exhibiting homogeneous and superficial alteration may indicate modern manufacturing with an artificial patina.
This step allows for the differentiation of natural corrosion and artificial treatment. The preferential degradation of copper-rich areas, the presence of multiple corrosion products (cuprite, malachite, atacamite, etc.), the absence of recurrent chlorine or sulfur, or the association with sediments are signs of authenticity.
For example, an authentic bronze will show complex deposits associated with natural sediments, whereas an artificial patina will generally include high levels of chlorine or sulfur.
A superficial corrosion, homogeneous and rich in chlorine, indicates artificial alteration, typical of a copy. Even after intense cleaning, scanning electron microscopy analysis remains effective: the corrosion processes infiltrate deeply and leave detectable traces despite abrasion.
For over 20 years, CIRAM has been a leader in the scientific analysis of art objects. We offer unique expertise, based on cutting-edge tools, to meet the needs of the art markets and archaeology. Our analyses enable:
The authentication and dating of metals, particularly bronze, require advanced scientific skills and cutting-edge technologies. By choosing to entrust your works of art to the CIRAM laboratory, you benefit from recognized expertise to guarantee precise and reliable results.
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Contact our teamsMetallography allows us to observe the internal structure of a metal to identify manufacturing processes (melting, hammering...) and detect signs of age.
We analyze bronze, gold, silver, brass, copper, iron and other metal alloys used in the manufacture of objets d'art.
We use SEM-EDX, ICP-MS, ICP-AES and thermoluminescence tests to analyze compositions, structures and alterations.
Bronze is an alloy of copper and tin, while brass is an alloy of copper and zinc. We distinguish them by chemical analysis.
Yes, it can also be used to date archaeological artefacts and quantify the biomass content of industrial materials.
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