2009 May 29, 9:13"Developed in the late 1960s by Dutch physicist J. R. J. van Asperen De Boer, infrared reflectography (IRR) is a technique used to look through the paint layers. ... Many paints will appear partially
or completely transparent while others, such as black, will absorb the infrared radiation and appear dark."
art history science ir ir-reflectography
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