Mobili antichi veri o falsi? Metodi di accertamento dell'autenticità e datazione

www.AntiqueFurnitureAuthenticity.com Last updating: 29/07/2009


Fond. Gottfried Matthaes

Determining the authenticity of Furniture
and wooden sculpture
A section of the Museo d'Arte e Scienza

Scientific Methods
Spectroscopic Analysis of Wood:

Museo d'Arte e Scienza -Via Sella 4 - Milano

IR Spectroscopy:

absolute dating of different wooden parts of furniture.
verification of use of old wood.

IR Spectrography:

identification of wood types.

ATR Spectroscopy:

analysis of patinas and veneers.

Example: Spectroscopic dating analysis of a table (shown in the photo). Only the four legs are authentic, while the other parts are much younger.

These tests can be requested also by sending directly to our laboratory samples of wood dust taken from the furniture item following the instructions provided in our website: www.SpectroscopyForArt.com.

Acknowledged value
of the museum’s scientific laboratory and its methods
for determining authenticity

Attitudes towards and use of scientific methods are influenced by local laws and customs.

Basis of judgment: the situation in Italy (where the museum is located).

The prime institution for the fight against forgery and imitations is the Guardia di Finanza or Financial Police. The most recent catalogue on the determination of authenticity in art, published by the same in June 2007, contains an exclusive six-page presentation of the scientific laboratory of the Museo d’Arte e Scienza in which its methods for dating paintings, furniture, and objects in ivory and other materials are illustrated in detail and their validity, in effect, endorsed.

Judicial proceedings. The probatory value of the spectroscopic dating method is crucial to the outcome of civil and penal judgments involving the determination of the actual age of art works.

Other scientific tests and examinations made by our laboratory

The Museum laboratory’s mission is to improve existing scientific methods and
elaborate new methods for the ascertainment of the authenticity of art objects.

Appraisals and valuations not available.
The laboratory’s instruments and know-how for the determining of authenticity are at the disposal of collectors, art experts, restorers, art galleries and museums. (The staff of the laboratory, who speak the main European languages, are at your disposal for any explanations).

Examples of spectra of the spectroscopic analysis of material other than wood

These spectra give a clear verdict on the nature of the material and permit the identification, for instance, of certain types of glues, lacquers, ivory, horn, bone, old and new amber, plastic, etc.


Evaluation of the use of natural or synthetic glues with Wood's light.	Monochromatic and ultraviolet light, as well as microscopic research show up the quality and the wear of gilding.

Identification of working techniques to verify the period of construction of furniture.	Analysis of natural or artificial damage and signs of wear.	Microscopic and chemical analyses for the evaluation of mounts, locks, figures and other parts made of bronze and other metals.

Some practical tests for the owners of furniture for ascertaining authenticity
Inspection of signs of wear and patinas

Furniture feet, owing to contact with the floor, show the typical wear due to repeated washing: this authentic and convincing characteristic is known as a "wash patina".		A natural hand-rubbed patina has formed where hands rested on the surface of the wood. A magnifying glass permits the distinction of a natural patina from a mechanical one.

Optical analysis of inlaid work: handmade or industrial work?

Decisive for the identification of handmade work are the gaps in the wood and the irregular inlaid pieces typical of handmade work.		Inlaid work made by machine in a mould shows pattern edges that fit together perfectly.

Interactive test stations in the other rooms of the Museum

at the disposal of visitors for simple tests for ascertaining the authenticity of antiques


test station room 8: sniff test on excavated pottery	test station room 9: test for revealing use of plastic	identification of glues and other synthetic materials with Wood’s light	test station room 9: examination with a magnifying glass of signs of wear and decorations on china


optical examination of signs of wear to identify an authentic piece of silverware	shadows reveal the industrial or handcrafted manufacture of glass	the microscope distinguishes authentic patinas and encrustations from faked ones	the dull sound of a porcelain item reveals hidden restoration work

PRICES: the average cost of analyses is Euro 150 per test; some tests are conclusive in telling fake and authentic items apart, such as wood dating and tests on the encrustations on pottery and bronzes.
For more information contact: Dr. Peter Matthaes (laboratory director), Silvia Mayer (customer contacts). Tel. 0039-02-72022488 - Fax. 0039-02-72023156 - Email: info@museoartescienza.com

NOW OPERATIVE !

Branch of the Milan scientific laboratory for determining the authenticity
of valuable antique art objects

The announced laboratory in Germany to serve central Europe is
now operative for the taking of samples from wooden objects to be dated and for the issuing of certificates.

Please contact Dr. Martin Matthaes
+49 (0) 1735853707 – mm@museoartescienza.com

The house, which has belonged to the Matthaes Foundation (Museo d’Arte e Scienza) for 45 years, is situated on the shores of Lake Constance, near Lindau.

Other requests may be sent, as always, directly to the Milan laboratory at the following address:

Museo d’Arte e Scienza
Via Q. Sella 4 – 20121 Milano
Tel. 0039 02 72022488
Fax 0039 02 72023156
e-mail: info@museoartescienza.com

For further info:

www.Museoartescienza.com www.Spectroscopyforart.com
www.PaintingsAuthenticity.com www.AfricanArtAuthenticity.com and other sites

	The value of art expertise in the scientific age
	The judgement of a renowned expert or a famous auction house has, at times, the magic power to push an article’s market value up by as much as a thousandfold. Thus a fine piece of furniture, a painting or an African mask may just as easily cost €1,000 or €1,000,000. This disconcerting difference in value estimates is becoming increasingly common in the international market. This would be conceivable if the appraisal were based on meaningful and verifiable data. Unfortunately this is not always the case.
€ 4,500 Authentic		€ 5,000,000 Auction of June 18, 2006
Over the centuries, well-to-do families and museums the world over have accumulated an unimaginable quantity of precious art treasures of incalculable commercial and art historical value. It is widely held, however, that over half of these works are not authentic. In the absence of scientific methods, such conclusions were based mainly on opinions. A critical application of the new and accurate methods for ascertaining authenticity to this immense cultural heritage without the consent of its curators is neither thinkable nor desirable. On the other hand, with the Internet and other media invading the homes of collectors and investors worldwide, it is inevitable that false assertions regarding technical methods for determining authenticity are revealed for what they are. By discrediting scientific analysis, the art market certainly also harms itself. As a result, buyers and investors are increasingly inclined to make their purchases from large and relatively reliable auction houses. There is a tendency of this kind in all sectors and small dealers are forced to close down. But it is precisely the art sector which could escape this trend. Today gallery owners and art dealers are, in fact, in a position to complement their expert opinions with accurate scientific certificates, thus providing a more dependable guarantee of safer and fairer purchases than the large auction houses. Attitudes, as well as guarantees, need to be changed and scientific analysis should be seen as a useful and advantageous instrument and no longer as an obstacle or a threat. A valid method - IR Spectroscopy - the most widely used analytic method in the chemical industry and in scientific research laboratories, has existed for decades. Get further and detailed information from our web site: www.SpectroscopyforArt.com

Short description of the natural and scientific foundations of the spectroscopic dating of wood The essentials in brief
Infrared spectroscopy is not a new method or a new discovery. New is only its application for the ascertainment of age and authenticity in art. It has been used for decades the world over by all chemical and pharmaceutical companies with thousands of instruments and with the same programme and equipment as the ones used by the laboratory of the Museo d’Arte e Scienza. Its extreme reliability, accuracy and facility of use have made IR Spectroscopy the number one scientific method in all the fields where it can be applied. Spectroscopic dating is based on two well-known factors: · All the natural materials on earth, including those used for creating art objects, are compounds of specific molecules. · Some particular molecules undergo changes with the passage of time. The IR spectrum of wood shows its molecules or groups of molecules as peaks and valleys (Figures 1, 2). Signs of age caused by evaporation, oxidation and new combinations cause the lowering of some absorption peaks and, to a lesser extent, a shift in the same (Figure 3). This dating method therefore offers two possibilities for the evaluation of the spectrum, each one already giving good results singly. 1 – The graphic evaluation of the curve (Spectrography) Right from the start of this research, the spectrographic measurement of the angle (α) formed between peaks of different heights permitted a dating accuracy of +/- 20% and these findings were communicated at the time, around 1995, to a number of European museums and institutes.
		Figure 2

Figure 1

2 – The evaluation of frequency shifts (Spectroscopy)

The discovery of shifts in absorption frequencies in spectroscopic analysis has boosted accuracy over the years to an unexpected extent and was inexplicably high in the first few years.

(Figure 3) - The diagram to the right is only one example of the many characteristics of a spectrum.

At present we are attempting to trace this accuracy, as well as independence from climatic conditions, to biological programmes inside the cellular nucleus of the tree. The incredible precision of these types of biological programmes in general are well-known and understandable for the growth of wood. An answer to the question why the ageing of wood must also be programmed can be supplied only by the evolution of cellular research.

Tree cells, unlike animal cells, are highly protected by a wall of cellulose, a hydrocarbon. Cellulose is extremely resistant to water and wood cells as well as datable wooden material can still be found in excavated Roman ships.

Figure 4

Research in collaboration with a German
archaeological museum (1995).

Generation of reference tables to relate spectrum data to wood age:

The assignment of a spectrum to a specific wood species and to a specific age required the measurement of a great quantity of wooden objects of certain dating. This research, which called for many years of work on the part of qualified personnel was made possible only by the close and benevolent cooperation of international museums which began around 1993. The collaboration of some art museums terminated around 1995, since their curators feared there could be negative consequences for their collections. The Gottfried Matthaes Foundation, proprietor of the Museum, is, like the P. Getty Foundation, a non-profit organization at the service of art. Our cooperation with technical museums has continued.

The application of spectroscopic analysis for the dating of organic materials is patented
(It. Patent Nr. 01266808 - G. Matthaes, 1993)

	Ivoire Défense d’éléphant ou Plastique ? Il est aujourd’hui possible de reconnaître facilement l’ivoire authentique
Instrument de musique en ivoire, Afrique		Temple bouddhiste, Chine (ivoire)
Classification des matériaux
On classe parfois dans la catégorie « ivoire », de manière erronée, outre les défenses d’éléphants, les cornes d’autres animaux ainsi que certains types d’os. Par ailleurs, on produit de nos jours des matériaux synthétiques toujours plus sophistiqués : il s’avère alors difficile de les distinguer de l’ivoire par simple examen oculaire. Tous ces matériaux sont composés de molécules distinctes qui se reconnaissent à l’analyse spectrographique de manière simple et explicite (voir fig. à droite). Pour effectuer cette analyse, il suffit de prélever quelques milligrammes de matériau (perceuse électrique) et d’envoyer l’échantillon par la poste à un laboratoire spécialisé. Contacts: à Milan: Dr. Peter Matthaes pr@museoartescienza.com en Allemagne: Dr. Martin Matthaes mm@museoartescienza.com Datation Il est possible d’effectuer une analyse sur de l’ivoire authentique, dans le but de déterminer son âge. Le procédé est toutefois rendu légèrement compliqué dans la mesure où, afin de prélever un échantillon, il est nécessaire d’apporter l’objet ou de l’expédier au laboratoire central du Musée, à Milan, ou à sa succursale allemande. Il y sera conservé une trentaine de minutes au maximum. L'ivoire se distingue par son aspect solide, compact, brillant et résistant, caractéristiques liées à sa composition chimique. Les matériaux inorganiques en constituent l’élément prédominant, comme le phosphate et le fluorure de calcium, dont l’âge n’est pas calculable. Des substances organiques sont également présentes, subissant avec le temps des modifications, selon des processus biologiques. L’analyse spectroscopique à infrarouge met en évidence les molécules présentes dans les matériaux, permettant ainsi de clairement distinguer les substances inorganiques de l’ivoire de celles organiques. En ce qui concerne ces dernières, des méthodes analytiques pour la datation peuvent être appliquées permettant de sélectionner des molécules dont l’âge est calculable.
L'application de l'analyse spectroscopique pour la datation des matières organiques est brevetée (Brevet It. N° 01266808 - G. Matthaes, 1993)

PRIX: Classification du matériel: 100 € par analyse. Datation d'un objet en ivoire: 150 €

Ample descriptions of these methods in

The Art Collector's Illustrated Handbook
(Three volumes, over 2,000 detailed colour photos, concise explanatory texts)

The Art Collector's Illustrated Handbook

With this guide to detecting fakes, you will always have a trusted expert by your side, ready to provide you with clear and straightforward answers as to the authenticity and originality of the items that arouse your interest.

Title:

THE ART COLLECTOR'S ILLUSTRATED HANDBOOK (three volumes - three languages)

The Author, Gottfried Matthaes, a physicist, was born in Germany of a family of longstanding artistic tradition and since 1960 has dedicated himself to the study of practical and scientific methods for the ascertainment of authenticity. In 1990 he founded the "Museo d'Arte e Scienza", the only one of its kind in the world, in the centre of Milan where most of the objects illustrated in the handbooks are exhibited, together with its attached laboratory. In 1993 he discovered and patented the application of IR spectroscopy for the age dating of wooden art objects.

Contents:

VOLUME 1:	Ivory, Paintings, Icons, Carpets and Rugs, Tapestry, Furniture, Glass, Ceramics, Scientific Methods
VOLUME 2:	Paper, Books, Prints, Metals, Clocks, Walking Sticks, Pipes, Musical Instruments, Precious Stones, Amber, Pearls, Enamel Paint, Dolls, Toys, Fans
VOLUME 3:	Minor Asian Arts, Excavated objects, Buddhist Art, African Art, Indonesian Art

Description:

didactic, richly illustrated (about 2,000 colour photos, especially of details and enlargements, with short explanatory texts)

Dimensions:

cm 20 x 25

Style:

easy to consult, to take along when visiting exhibitions, flea markets, when travelling

Price:

Volume 1 (278 pages) 30.00 Euro - $38
Volume 2 (128 pages) 20.00 Euro - $25
Volume 3 (128 pages) 20.00 Euro - $25
Shipping charges are not included and will be communicated depending on the country and the number of books.

Edition:

glossy paper, reinforced cardboard covers

International Code:

Volume 1 - 1997, Code ISBN 978-88-900454-5-5
Volume 2 - 1999, Code ISBN 978-88-900454-6-2
Volume 3 - 2000, Code ISBN 978-88-900454-7-9

How to buy it:

in all bookshops giving the above mentioned ISBN code number
directly at the Art and Science Museum (with discount)
by e-mail

Examples of pages taken from volume 1

Volume 1 chapter "Furniture" 70 pages
	173

MUSEO D'ARTE E SCIENZA - MILAN

Palazzo Bonacossa - Via Q. Sella, 4 -20121 Milano - Piazza Castello

Opening Hours: Mon.- Fri.: 10:00-18:00 Entrance: Euro 8 - reuced Euro 4
Guided tours: (min. 10 people) Euro 10 - Students: Euro 7
Info: Tel:+390272022488. Fax:+390272023156. e-mail: info@museoartescienza.com

Short description of the natural and scientific foundations of the spectroscopic dating of wood

Short description of the natural and scientific foundations
of the spectroscopic dating of
wood