Infrared Reflectography (IRR) allows for identifying underdrawing and pentimenti. IRR is coupled with the panoramic method. It is performed with a scientific camera (InGaAs) that can image in the range 900- 1700 nm. Pigments such as azurite, Prussian blue, and malachite become transparent only in the far-infrared at about 1500 nm. InGaAs cameras are the standard for Infrared Reflectography. Unfortunately, they have small sensors of … Continue reading Course: Panoramic Infrared Reflectography