赤せき外がい線せん写しゃ真しん

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Meanings

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infrared photography

Technical term for photography using infrared light, often used in scientific, forensic, or artistic contexts.

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Infrared photography can capture subjects even in darkness.

この美び術じゅつ館かんでは、赤せき外がい線せん写しゃ真しんを使つかって絵えの下したに隠かくれた下した絵えを調ちょう査さした。

At this museum, they used infrared photography to examine the underdrawing hidden beneath the painting.