NON-DESTRUCTIVE OPTICAL ANALYSIS ON PAINTINGS
It is of fundamental importance to perform scientific analysis on the works of art that consolidate or refute an historical or artistic hypothesis. Our usual procedure is to perform optical non-destructive analysis that can provide information on the artistic technique and on the signs of aging, without making any change to the conservation status of the work of art and without the need of sampling.
Digital photomicrography gives information on the aging of the surfaces, on the presence of forgery, on the history of paint layers and on the size of the particles of the pigments used.
EXAMINATION UNDER ULTRAVIOLET LIGHT
Thank to the light emitted by the so-called Wood's lamp we are able to illuminate the surface of the works of art with a light different from that found in the visible spectrum, and then not perceived by the human eye. The reflected light in the visible spectrum from different materials, allows us to distinguish any adjustment, retouching and forgery, in addition to observe the presence of oxidized paint or forgery of the signatures.
This analysis exploits the capacity of the near to the visible spectrum infrared to penetrate the paint layers of a painting. The reading of the visible reflection of a beam of infrared light can provide information on the presence of any preparatory drawing, second thoughts of the artist or about the presence of any existing paint layers underneath the visible one.