Instead, it can be used to provide insight as to when the art piece was likely made as well as determine the composition of the materials used in its production. Art Dating, Art Age, Forensic Authentication and Authenticity are all possible through the proper use of forensic science and provenance. The forensic examination of art begins from a point of complete neutrality. The art is examined using state of the art equipment to analyze the materials as well as to determine whether there is any indication of fraud through artificial aging, forgery or copying.
Porcelain pieces can also be tested using the same approaches. Ultraviolet and infrared fluorescence and luminescence are useful in determining whether a piece has been brought into contact with extraneous chemicals to induce artificial age as well as to better examine for normal aging characteristics, repaired damage, etc.
A High Resolution Video Spectral Comparator can be used to examine the piece with various forms of electromagnetic radiation and filters. High resolution digital photographs can yield additional information for the forensic examination.
Following are some examples at 50x and x magnification of questioned mammoth ivory and a clay sculpture: Porcelains can also be tested forensically. Digital images can yield information regarding the glazing, method of construction and aging characteristics. Following are a few examples: Xray Fluorescence Spectroscopy XRF has greatly advanced in the past few years to the point that an art piece can be examined without causing any harm or damage to the composition.
Samples no longer need to be removed and the piece can be tested locally. XRF yield information regarding the inorganic composition of the piece.
This is important in reaching an opinion about age or origin. Clay samples can be compared to determine if the clay source was different. Paints can be analyzed to determine whether chosen pigments were typical for a particular artist as well as available during a particular period.
An example would be with white oil-based paint. XRF can not only tell the examiner whether the art contains inorganic components, e. This can be useful when an artist is known to have mixed various paints to achieve particular colors. It is also useful in determining whether the titanium, for instance, is due to the soil or quartz found in the clay in the case of a porcelain or else from the glazing material or paint.
Individual areas are separately tested allowing for a close determination as to the source of a particular inorganic component. Iron, lead, titanium, silver, gold, cadmium, cobalt, chromium, zinc and numerous other elements can be analyzed using state of the art XRF equipment.
The presence or absence of the inorganics is critical in addressing the age or authenticity of a piece of art, whether it be a fine art painting, construction, or porcelain piece. Even the composition of the nails or tacks can help date a piece. Zinc yellow lemon yellow contains zinc and has been used in paints since around Naples yellow contains lead and has been in use in paints since the sixteenth century. Cadmium yellow has been used in paints since Vermilion red paint was used between and and was widely replaced by cadmium red in Chromium orange has been in use since around Viridian green paint contains chromium and has been in use since around Cobalt green paint is composed of zinc and cobalt and has been in use since the early s.
Cerulean blue paint is cobalt based and began wide use in paints around Cobalt blue began use in paints in FTIR examines the organic composition and provides a transmittance or absorbance spectra of the paint, coating or other organic material.
Polymerization Binding is examined through the use of microscopy and the reaction to various forms of electromagnetic radiation. All of these approaches are used to provide insight as to the age of the materials. In addition, they develop information regarding whether the piece was falsely created using more recently available items or else through the manipulation of the appearance of age. Forensic science and provenance together can help prove or disprove authenticity.