Begin with a question
A useful examination asks something specific about structure, materials, working process or condition. The National Gallery describes technical analysis as a way to investigate how, and sometimes when, paintings were made.
Use complementary views
The Gallery’s research brings together visible-light images, infrared reflectograms, X-radiographs and spectroscopic imaging. Each records different properties. Comparing the results requires attention to scale, registration and the area examined.
Read the report, not just the illustration
Record the method, conditions, examined area and the interpretation supplied by the examiner. If sampling was involved, its location matters. A cropped image without its report may remove the qualifications needed to interpret it.
A museum example
The National Gallery’s record for Jan van Eyck’s Arnolfini Portrait discusses evidence from infrared reflectography about stages of underdrawing. It also provides provenance information. These are related research strands, presented as distinct parts of the object’s record.
Avoid a shortcut to authorship
A material observation does not automatically identify a maker. Its significance depends on context, comparison and the question asked. A public reference to a technical report is not a substitute for examining that report.
References & reading
- National Gallery — Technical analysis Institutional research resource
- National Gallery — Multimodal analytical imaging Institutional research resource
- National Gallery — The Arnolfini Portrait Museum object record
Source pages reviewed 22 September 2026. The discussion is an editorial synthesis; it is not a finding about the authenticity of a particular work.