Fig. 5From: The young Van Dyck’s fingerprint: a technical approach to assess the authenticity of a disputed painting a Infrared reflectogram; b composite X-ray image; c annotated IRR detail of the skull showing drawing lines applied with a carbon-based dry medium; d IRR detail of St Jerome’s left hand showing traces of the carbon-based fluid medium along with e visible wavelength close-up image of the same area showing the reworked dark outlines applied with a brush and fluid mediumBack to article page