Methods to know whether the painting fake or not
Spectroscopic techniques
Painted by one of Rembrandt's students
Electromagnetic spectrum
The UV spectrum
Poleye
A hundred years old
IR
Composed of three elemental colors
Yellow
Blue
Green
Pinted during 1839-1906
IR
An underdrawing charocal in it
Short-wave and long-wave UV
Pigements were made in the same studio
The fluorescence data contradict the ultraviolet data