Mr. Ilsink and his team were able to visualize those layers, using infrared photography and infrared reflectography, and they said that the "St.
Infrared reflectography is the use of infrared radiation to penetrate below the surface of paint and visualize compositional paint changes and preparatory sketches [1].
Infrared reflectography has revealed that Renoir painted two more mature female figures behind her.
Conservators investigate materials and techniques using microscopy, X-radiography, X-ray fluorescence, and infrared reflectography.
It would join methods such as DNA testing, pigment analysis and infrared reflectography, which looks at hidden layers.
Infrared reflectography, a technique used to look at details not visible to the naked eye, has also revealed more information on how Botticelli designed and painted the portrait.
He added that Sotheby's old master experts had brought in scholars who examined the painting with infrared reflectography, which reveals the drawing beneath a painting's surface.
Numerous materials analysis and imaging techniques have been used to study the object, including infrared reflectography (IRR), and ultraviolet-induced visible fluorescence imaging.
New recruits to the field are exhaustively versed in the ethics of conservation and the chemistry and the physics of the materials involved, and they may be adept with X-rays, infrared reflectography, digital macro photography, and other analytic gear.
Each head was examined by manual inspection, infrared reflectography (IRR), CT and microscopic hair analysis, with ten new differentiating characteristics identified.
