Dating painting canvas
Moreover, the fact that the position of these cracks corresponds to that of the inside corner of the current stretcher is further confirmation that the side strips are definitely original.
The attached photo, which shows the lower corner near the signature, points out very well this characteristic (red arrows).
Thanks to the laboratory's modern equipment, a painting can be subjected to analysis using infrared reflectography, Wood's light, a stereoscopic microscope, IR spectroscopy and other instrumental techniques.3 e 4 - Microscopic analysis to examine the signs of ageing in the paint layer: the nature of the craquelure (natural or artificial - deep or superficial), the pigments (crystallinity, purity and size), restoration and other factors.
Wood's light and monochromatic lights permit an evaluation of the extent to which the painting has been restored, touched up and overpainted, as well as the identification of various fluorescent substances.7, 8 e 9 - Infrared reflectography permits an in-depth examination of the painting bringing to light underdrawings or grids, pentimenti, the depth of the craquelure, and identification of restoration work or the use of different materials.
The ascertainment of the authenticity of this painting has been carried out with scientific tests on the material and through the study of techniques and signs of wear.
In detail: 1) with the spectroscopic dating of the wooden stretcher once proved its originality 2) with stereo microscopic analyses for the study of the painting layer: the drying of the paint binder, the craquelure, the sign left by the stretcher, etc.
In the past, when called on to appraise and attribute a painting, art experts examined only the surface under natural light.