I finally got the chance to peruse the Fletcher and Gardiner exhibit at the Met this past Wednesday. I examined each luminiferous piece then read the accompanying placards and, more often than not, just shook my head in wonder. I returned home with one burning question. In this world full of fakes and forgeries, how can the curators be so certain that they’ve got the real thing?
Part of me wanted to believe there was a little, artsy know-it-all lurking somewhere behind a shiny green curtain, an expert who could map the provenance and patina of any piece at a mere glance. If you actually take a peek behind the scenes at a major museum these days you’re bound to find, not the Wizard of Art, but a team of technicians working with high-tech gadgets like the X-Ray Fluorescence (XRF) Spectroscope.
Following the accidental discovery of x-rays by Wilhelm Roentgen in 1895, scientists set about mining the ray’s potential to be employed as an analytical tool. Here’s a simplified version of the notion:
If an object is bombarded with a sufficient amount of high-energy x-rays its atoms will enter an unstable condition. In order to regain stability the atoms must produce their own set of secondary x-rays. These are known as fluorescent x-rays.
“Because each element has a unique set of energy levels, each element produces [fluorescent] x-rays at a unique set of energies, allowing one to non-destructively measure the elemental composition of a sample.” (www.amptek.com)
A series of advances eventually led to the development of the first x-ray spectrometer by Friedman and Birks in 1948. After time, and a few adjustments to the original design, XRF Spectroscopy is now the preferred method for non-destructive elemental and chemical analysis of minerals, metals, porcelain, wood, and glass. The method was employed by NASA astronauts to study lunar rock samples on two different Apollo missions. It has also been applied to a number of other scientific fields such as forensics and archaeology, and the study of fine art and antiques.
When it comes to silver antiques, scientists must compare x-ray results to what we know of the silver manufacturing and production techniques of each particular epoch. For example, before purification by electrolysis became popular in the mid-1800s, decorative silver contained traces of gold, lead, and other natural impurities. If an artifact dated prior to that period does not contain traces of other elements it’s liable to be a fake. Such was the case when a large number of forgeries were found in Arthur Lenssen’s collection of antique colonial silver after it was donated to The Winterthur Museum and Country Estate.
As a collector, the ability to confidently assess the authenticity of an artifact is of utmost importance. All of us here at Nelson & Nelson Antiques want you to know when you’ve got the real deal, alas, we cannot all afford to purchase an XRF Spectroscope and hire a team of personal technicians. So, in future articles, we’ll be doling out practical tips and visual cues that the average collector can use to help spot fakes and forgeries with the naked eye.
Stay tuned!