reflectography
/ˌriːflɛkˈtɒɡrəfi/ /rɪflɛkˈtɒɡrəfi/noun
Any of various techniques for producing an image or graphical representation based on properties of reflection; specifically a technique for revealing hidden drawing lines beneath paintings using infrared scanning.
Origin
1940s; earliest use found in Photography Journal. From reflect + -o- + -graphy, after reflectogram or reflectograph.