SCIENCE, TECHNOLOGY AND EUROPEAN CULTURAL HERITAGE Proceedings of the European Symposium, Bologna, Italy, 13-16 June 1989 Edited by N.S. Baer Conservation Center Institute of Fine Arts New York University 14 E. 78th Street New York, NY 10021, U.S.A. C. Sabbioni CNR, Istituto per lo Studio dei Fenomeni Fisici e Chimici della Bassa ed Alta Atmosphère via de Castaguoli I 40126 Bologna, Italy A.I. Sors Commission of the European Communities Directorate-General for Science, Research and Development Environment Research Programme Rue de la Loi 200 B-1049 Brussels, Belgium Published for the Commission of the European Communities by Butterworth-Heinemann Ltd Butterworth-Heinemann Ltd Linacre House, Jordan Hill, Oxford 0X2 8DP ®· PART OF REED INTERNATIONAL BOOKS OXFORD LONDON BOSTON MUNICH NEW DELHI SINGAPORE SYDNEY TOKYO TORONTO WELLINGTON First published 1991 Publication No EUR 13110 EN of the Commission of the European Communities, Scientific and Technical Communications Unit, Directorate-General Telecommunications, Information Industries and Innovation, Luxembourg © ECSC-EEC-EAEC, Brussels-Luxembourg 1991 Legal notice Neither the Commission of the European Communities nor any person acting on behalf of the Commission is responsible for the use which might be made of the following information. All rights reserved. No part of this publication may be reproduced in any material form (including photocopying or storing in any medium by electronic means and whether or not transiently or incidentally to some other use o fthis publication) without the written permission of the copyright holder except in accordance with the provisions of the Copyright, Designs and Patents Act 1988 or under the terms of a licence issued by the Copyright Licensing Agency Ltd, 90 Tottenham Court Road, London, England W1P 9HE. Applications for the copyright holder's written permission to reproduce any part o fthis publication should be addressed to the publishers. British Library Cataloguing in Publication Data European Symposium 'Science, Technology and European Cultural Heritage' (1989 Bologna, Italy) Science, technology and European cultural heritage: Proceedings of the European Symposium, Bologna, Italy, 13-16 June 1989. 1. Title II. Baer, N.S. III. Sabbioni, C. IV. Sors, A.I. 702.8094 ISBN 0 7506 0237 6 Library of Congress Cataloguing-ln-Publlcation Data Science, technology, and European cultural heritage: proceedings of the European symposium, Bologna, Italy, 13-16 June 1989/edited by N.S. Baer, C. Sabbioni, A.I. Sors. p. cm. Includes bibliographical references and index. ISBN 0-7506-0237-6 1. Cultural property, Protection of—Europe—Congresses. 2. Architecture—Europe—Conservation and restoration—Congresses. 3. Historic buildings—Europe—Conservation and restoration— Congresses. 4. Historic sites—Europe—Conservation and restoration—Congresses. I. Baer, N. S. II. Sabbioni, C. III. Sors, A. I. (André I.) IV. Commission of the European Communities. CC135.S35 1991 363.6'9Ό94—dc20 91 -3428 CIP Printed in England by Clays Ltd, St Ives pic PREFACE This book contains the updated Proceedings of the European Symposium "Science, Technology and European Cultural Heritage," which was held in Bologna, Italy, 13-16 June 1989. It was organized by the Commission of the European Communities' Directorate General for Science, Research and Development, in association with the National Research Council (CNR) of Italy, and formed part of the Ninth Centenary Celebrations of the University of Bologna. The Symposium brought together more than 400 people from within the European Community, from other parts of Europe, from North America and beyond; many of them internationally recognized scientists, conservators, art historians, and architects. Also participating were staff of national and international agencies. The Symposium had a number of important and broad objectives, as follows: o To assess the major problems in this field and the role of scinece and technology in their solution. o To identify and discuss the main research and development issues which are common to a range of cultural heritage problems and to increase the coherence of current efforts across this multi- disciplinary field. o To enhance the applicability of research and development to this field through better matching with the real needs of conservators, restorers, policy makers and the general public. o To catalyze the development of a European research community in this field. o To recommend specific research and development directions for the future, including the provision of a scientific basis for European Community policies on environment and culture. Toward these aims, a wide-ranging and flexible scientific programme was prepared, including invited state-of-the-art reviews, illustrative case studies, panel discussions and poster presentations. XIX During the final Session, the Symposium was addressed by Sir John Kendrew, Nobel laureate and past-president of the International Council of Scientific Unions (ICSU). Though the editors have critically reviewed all of the papers and posters and have communicated with the authors, the limits of the camera-ready publication process and the desire to provide as complete a record of the Symposium as possible, leave the end result short of full peer review. It should also be noted that for a majority of the authors, the requirement of publication in English deprived them of the richness of expression associated with their writings in their native languages. We acknowledge with gratitude their cheerful response to the idiosyncratic nature of scientific English. Based upon this material, the book also includes an introductory overview of the critical issues related to scientific and technical aspects of the protection and conservation of European cultural heritage. The organizers consider that the original objectives of the Symposium have been fully satisfied. The meeting provided a comprehensive review of the state of the art across this field and also offered good insights into the specific projects currently being undertaken. The discussions, both within and outside the meeting room, were lively and constructive. It is hoped that this Symposium has provided some directions for future progress in this vital and complex research area. The Commission of the European Communities and the Editors wish to thank the Scientific Committee for its advice in the organization of this Symposium. The support of Ph. Bourdeau, H. Ott, G. Angeletti and G. Weidenbach in the CEC, and of D. Camuffo (Padova) and M. del Monte (Bologna) are gratefully acknowledged. Finally, this book would not have seen the light of day without the patient, organized and efficient work of Mrs. Jenny Lebis in Brussels as well as of Ms. Marlis Müller in New York. N.S. Baer C. Sabbioni A.I. Sors xx SCIENZA, TBCNCHJOGIA E PATRBCNIO EGRGPEO Introduzione di Manfredo Macioti Commissione délie Comunità Europee II Simposio si iscrive nel quadro delle celebrazioni dei 900 anni délia prima université d'Occidente (1088). Bologna, città cosmopolita. Come allora, abbiamo il piacere di poter contare sulla attiva presenza al Simposio degli "Ultramontani" e dei "Citramontani". Bologna, città d'Arte e di Storia. Simboleggiata dal Palazzo di Re Enzo, dove ha luogo il Simposio. E' nel XIII secolo ehe vi fu ospite (prigioniero) Enzo, figlio di Federico II di Svevia, (Hohenstaufen). Bologna, la dotta, Città delle scienze. Dalla scienza giuridica delle origini, alla medicina del XII secolo; a Marcello Malpighi nel '600; a Luigi Galvani ehe qui a Bologna pubblicö nel 1791 il suo "De viribus electricitatis in motu musculari". Quasi 100 anni fa dalle collini bolognesi Guglielmo Marconi effettuava le prime trasmissioni senza filo. Oggi Bologna, con più di 2200 autori scientifici citati ogni anno nella letteratura mondiale, é il terzo centro scientifico d'Italia e si appresta a costruire il suo polo scienza-teenologia. Importanza di conservare il nostro patrimonio culturale europeo, del quale Bologna offre tanti elementi d'eccezione. Alla vigilia del Grande mercato senza frontière del 1992, questo sforzo di conservare le nostre radici umanistiche é particolarmente urgente. Parte délia qualità délia nostra vita, parte délia specificità europea. Le minacce al patrimonio culturale non sono state mai tanto grandi : Il passare del tempo, i fattori ambientali, i rischi di natura, l'urbanizzazione, l'industrializzazione, e le pratiche agricole sempre più intense ... Tutti questi fattori contribuiscono al degrado delle opère d'arte. E' quindi essenziale ehe il meglio di quel ehe la scienza e la tecnologia hanno da offrire sia applicato alla conservazione del nostro patrimonio. Eppure, non lavoriamo ancora in modo razionale in Europa. Citero, tra l'altro: 1) Le linee di comunicazione assai precarie tra scienziati ed ingeneri da un lato e gli "utilizzatori" dall'altro (restauratori, conservator!, architetti ...); 2) il lavoro si fa in modo frammentario, su monumenti ed opère singole o "nazionali", senza allargare il discorso ad XXI applicazioni più ampie, e senza adeguati interscmabi al di là delle frontière. Manca un sottofondo, manca una massa critica di ricerca fondamentale e strategica. Mancano pure norme comuni, piani di studio moderni; mancano perfino, mi sembra, riviste scientifiche rappresentative; 3) l'applicazione di conoscenze scientifiche e tecnologiche esistenti al problema ehe ci intéressa, é insufficiente. Si potrebbe fare assai più per utilizzare, in campo di conservazione le tecnologie dell'olografia, delle membrane, f dei laser, del telerilevamento ... Ci sono in materia di ricerca scientifica varie Qrgnaizzazioni internazionali ehe svolgono attività di primo piano : citerö l'ICRCM, l'ICCMDS, il RILEM, l'ILC (tra le non-governative) e il Consiglio d'Europa, la ECE delle NU, il CCMS della NATO, e il più récente progetto EUROCARE di Eureka (tra le inter-governative)). Per parte sua, la CEE ha responsabilité chiare (nell'Atto Unico del 1987) in materia ambiente ed in materia di ricerche. La CEE sta anche sviluppando elementi di una vera e propria politica culturale. Ecco perché la Ccmunità Europea si intéressa aile ricerche di protezione ambientale, ivi comprese le ricerche necessarie alla protezione del patrimonio culturale comune. I partecipanti al simposio troveranno riferimento al nostro lavoro (CCE) nella Research Review inclusa nella documentazione, e negli affissi (posters) in mostra. In sostanza si tratta di ricerche finanziate direttamente da Bruxelles e, forse ancora più importante, di coordinare e concertare le azioni di ricerca nazionali. Uno dei mezzi pratici di coordinamento é la Newsletter "European Cultural Heritage" (i partecipanti troveranno nella documentazione il numéro spéciale su Bologna). Anche questo Simposio é un esempio della nostra azione comunitaria. I nostri obiettivi, nell'organizzare il Simposio, sono francamente ambiziosi : (i) favorire migliori comunicazioni, (ii) accelerare la catalisi di una vera e propria comunità scientifica Europea, (iii) passare in rivista lo stato attuale delle conoscenze; (iv) ottenere gli spunti necessari per definire le future linee dell'azione di ricerca comunitaria (un punto particolarmente importante). Il Simposio é stato pensato (i) corne convergenza di valutazioni orali dei principal! problemi scientifici e teenici; (ii) studi puntualizzati aprofonditi (case studies); (iii) tavole rotonde globali; (iv) posters illustrativi delle ultime novita in campo ricerche. Il programma prevede una dimostrazione dell'on-line Conservation Information Network del Getty Conservation Institute; nonché una visita scientifica al complesso delle Chiese di S. Stefano. Vorrei sottolineare ehe sono stati accordati al simposio l'alto patronato del Présidente della Repubblica, nonché i patronati dei tre Ministeri dell'Ambiente; dell'Université e della Ricerca Scientifica e Tecnologica; e dei Béni Culturali e Ambientali. Vorrei salutare la presenza oggi alla tribuna del représentante del Governo italiano (il Prof. Sisinni). Vörrei XXll ringraziare il CNR (Prof. Maraldi), l'Université di Bologna (nella persona del chiarissimo Pro-Rettore, il Comune (nella persona dell'assessore Prof. La Forgia). I ringraziamenti della Coninissione vanno anche al Comitato Consultativo Scientifico (ehe conta esimi scienziati di vari Paesi Europei e degli USA). Saluto la presenza dell'Onorevole Prof. Mario Fedini, già Ministro della Ricerca e grande Europeista; e di Sir John Kendrew, laureato del Premio Nobel per la Chimica (1962) e già Présidente dell'ICSU. La Loro presenza ci onora tutti. Finalmente "last but not least" ringrazio i inembri del Comitato Qrganizzatore: Marco del Monte (Bologna), Dario Camuffo (Padova), Antonio Cesari (Bologna) e Cristina Sabbioni (Bologna) senza dimenticare i membro del nostro staff europeo: Heinrich Ott, Andrew Sors e Gianni Angeletti. Uno spéciale riconoscimento all'opera di Antonella Raimo e di Lorella Censi dello Studio Raimo. Prima di concludere permettetemi di citare il 4° principio fondamentale della Magna Charta délie Université Europee, elaborata qui a Bologna in occasione della Secularia Nona, nel settembre dello scorso anno: "Depositaria della tradizione dell'Umanesimo Europeo, ma con l'ijnpegno costante di raggiungere il Sapere Universale, l'Université, nell'esplicare le sue funzioni, ignora ogni frontiera geografica o politica ed afferma la nécessita inderogabile della conoscenza reciproca e dell'interazione delle culture". II senzo profondo di queste giornate d'incontro deve essere, a mio awiso, quello di un'eccezionale occasione per discussioni globali (e non specializzate). Vogliamo richiamare l'attenzione del mondo della Scienza, del mondo della Cultura, del mondo Accademico, del mondo Economico, delle Autorita politiche, nonché del Pubblico, sull' importanza del nostro patrimonio culturale e sull'urgente nécessita di studiarlo, preservarlo, restaurarlo e goderlo. Parafrasando Ilya Prigogine, dirö ehe la scienza oggi significa il pluralisme, la tecnologia oggi permette un livello di intercambi sempre più approfondito. Usiamo questi strumenti per awiarci verso quell ' immagine del mondo ehe Karl Popper preconizzava: una imagine dove, accanto alle scienze fisiche c'é poste per i fenomeni biologici, per la liberté dell'uomo e per la ragione. XXlll SCIENCE, TECHNOLOGY AND EUROPEAN CULTURAL HERITAGE* Welcoming Address by Manfredo Macioti Chief Adviser, Commission of the European Communities (CEC) Directorate General for Science, Research and Development This Symposium is held within the framework of IX Centenary celebrations of the University of Bologna, the first Western University, whose origins are traced to 1088. Bologna a cosmopolitan city. As during that time, we have the pleasure of the active presence at the Symposium of the "ultramontani" (transalpinians) and the "citramontani" (natives). Bologna a city of art and history, symbolized by the Palazzo di Re Enzo, where the Symposium is held. It was here in the Xllth Century that Enzo, son of Frederick of Swabia (Federico di Svevia) (Hohenstaufen), was a guest (prisoner). Bologna, the learned city of the sciences, from the juridical science of its origins, to the medicine of the 12th century; to Marcello Malpighi in 1600 and Luigi Galvani who here in Bologna published in 1791 his "De viribus electricitatis in motu musculari". About 100 years ago Guglielmo Marconi carried out the first transmissions without wire from Bologna's hills. Today Bologna, with more than 2200 scientific authors mentioned each year in the world literature is the third scientific centre of Italy and is countinuing to build its science-technology base. It is of great importance to conserve our European cultural heritage, of which Bologna offers many excellent examples. On the eve of the internal market of 1993, this effort to conserve our humanistic roots is particularly urgent. This is part of the quality of our life, part of the uniqueness of Europe. The threats to our cultural heritage have never been so important: passage of time, environmental factors, natural risks, urbanization, industrialization and more and more intensive agricultural practices. All these factors contribute to the deterioration of the works of art. Therefore, it is essential that the best of what science and technology have to offer is applied to the conservation of our heritage. Yet in Europe we do not work in a rational manner. May I mention among other factors: 1) Communication is very limited between scientists and engineers on one side and the users" on the other (restorers, conservators, architects, art historians, etc.). This is a translated version of the address given in Italian. XXIV 2) The work is done in a fragmentary way on monuments and single or "national" works of art, without enlarging the scope to wider applications, and without adequate exchange across borders. The background is absent, a critical mass of fundamental and strategic research is lacking too, as are common rules and modern plans of study: even proper scientific journals are lacking; 3) The application of scientific and technological knowledge to the problem we are interested in is not sufficient. Much more could be done to use, in the field of conservation, the technologies of holography, of membranes, lasers, remote sensing and the like. In the field of scientific research there are several international organizations which undertake valuable activities: I am referring to ICCROM, ICOMOS, RILEM (among the non-governmental) and the Council of Europe, the ECE of the UN, CCMS of NATO, and the most recent project, EUROCARE of EUREKA (among the governmental). The CEC has clear responsibilities (under the single Act of 1987) in the field of the environment and of research. The CEC is also developing elements of a real and Community-wide cultural policy. This is the reason why the European Community is interested in environmental protection, including the research necessary for the protection of the common cultural heritage. The participants in the Symposium will find reference to our work (CEC) in the Research Review included in the documentation and in the posters. This work consists of research funded directly by Brussels and, perhaps even more important, coordination of national research actions. One of the practical means of coordination is the Newsletter "European Cultural Heritage". This Symposium is also an example of our Community action. Our objectives, in organizing the Symposium, are frankly ambitious: (i) to encourage better cooperation, (ii) to catalyse the development of a real European scientific community, (iii) to review the present state of knowledge, (iv) to obtain the ideas necessary to define the future lines of the Community research action (a particularly important point). The Symposium has been designed to consist of (i) oral presentations of the main scientific and technical problems; (ii) case studies; (iii) general round tables; (iv) posters illustrating the most recent findings in the field of the research. The programme foresees a demonstration of the on-line Conservation Information Network of the Getty Conservation Institute and a scientific visit to the complex of the S.Stefano Churches. I would underline that the Symposium has been granted the high patronage of the President of the Italian Republic, as well as the patronages of the three Ministries of the XXV Environment; of the University and of Scientific and Technological Research; and of Cultural and Environmental Goods. I would like to salute the presence today of the representative of the Italian Government, Professor Sisinni. I would like to thank the CNR, in particular Professor Maraldi, the University of Bologna (represented by the Pro- Rector), and the Municipality, represented by the Alderman La Forgia. The thanks of the Commission go also to the Scientific Advisory Committee which is composed of distinguished scientists of several European Countries and of the USA. I welcome in the audience the Honourable Professsor Mario Pedini, former Minister of Research and a great European; and of Sir John Kendrew, Nobel Laureate for Chemistry (1962) and President of ICSU. Their presence honours us all. "Last but not least" I thank the members of the Organizing Committee: Marco del Monte (Bologna), Dario Camuffo (Padova), Antonio Cesari (Bologna) and Christina Sabbioni (Bologna) without forgetting the members of our European, staff: Heinrich Ott, Andrew Sors and Gianni Angeletti. A special acknowledgement is made to Antonella Raimo and Lorella Censi of the Studio Raimo. Before finishing let me mention the fourth fundamental principle of the Magna Charta of the European Universities, elaborated here in Bologna on the occasion of the Secularia Nona, in September of last year: "Depository of the tradition of European Humanism, but with the perpetual engagement to seek Universal Learning, the University in implementing its functions, ignores every geographic or political border and proclaims the immediate need for shared knowledge and for the interaction of cultures". The aim of these days should be, in my opinion, to provide an excellent occasion for general, not only specialized, discussions. We wish to call the attention of the scientific world, cultural world, academic world, economic world, political authorities and public opinion to the importance of our cultural heritage and to the urgent need to investigate it, preserve it, restore it and enjoy it. Paraphrasing Ilya Prigogine, I am saying that science today means pluralism, technology today allows a deeper level of exchanges. Let us use these instruments to go towards that image of the world evoked by Karl Popper: an image where, next to the physical sciences there is place for living phenomena, for the freedom of mankind and for rationality. XXVI