reflectography
Noun
An infrared technique used by art historians to detect layers beneath the top surface of a painting and thus determine whether it is an original.
Usage- Uncountable
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More examples (1)
IF a picture is worth the proverbial thousand words, taking a peek under the paint using infrared reflectography surely adds a few thousand more — especially when it comes to a work as detailed as the enormous 15th-century altarpiece from the Cathedral of Our Lady of the Ascension in Ciudad Rodrigo, Spain.