The conservation and restoration of cultural property focuses on protection and care of cultural property (tangible cultural heritage), including artworks, architecture, archaeology, and Museum. Conservation activities include preventive conservation, examination, documentation, research, treatment, and education. This field is closely allied with conservation science, and registrars.
The scope has widened from art conservation, involving protection and care of artwork and architecture, to conservation of cultural heritage, also including protection and care of a broad set of other cultural and historical works. Conservation of cultural heritage can be described as a type of ethical stewardship.
It may broadly be divided into:
Conservation of cultural property applies simple ethical guidelines:
Often there are compromises between preserving appearance, maintaining original design and material properties, and ability to reverse changes. Reversibility is now emphasized so as to reduce problems with future treatment, investigation, and use.
In order for conservators to decide upon an appropriate conservation strategy and apply their professional expertise accordingly, they must take into account views of the stakeholder, the values, artist's intent, meaning of the work, and the physical needs of the material.
Cesare Brandi in his Theory of Restoration, describes restoration as "the methodology moment in which the work of art is appreciated in its material form and in its historical and aesthetic duality, with a view to transmitting it to the future".
Conservation of cultural heritage as a distinct field of study initially developed in Germany, where in 1888 Friedrich Rathgen became the first chemist to be employed by a Museum, the Koniglichen Museen, Berlin (Royal Museums of Berlin). He not only developed a scientific approach to the care of objects in the collections, but disseminated this approach by publishing a Handbook of Conservation in 1898. The early development of conservation of cultural heritage in any area of the world is usually linked to the creation of positions for chemists within museums. In British archaeology, key research and technical experimentation in conservation was undertaken by women such as Ione Gedye both in the field and in archaeological collections, particularly those of the Institute of Archaeology, London.
In the United Kingdom, pioneering research into painting materials and conservation, ceramics, and stone conservation was conducted by Arthur Pillans Laurie, academic chemist and Principal of Heriot-Watt University from 1900. Laurie's interests were fostered by William Holman Hunt. In 1924 the chemist Harold Plenderleith began to work at the British Museum with Alexander Scott in the recently created Research Laboratory, although he was actually employed by the Department of Scientific and Industrial Research in the early years. Plenderleith's appointment may be said to have given birth to the conservation profession in the UK, although there had been craftsmen in many museums and in the commercial art world for generations. This department was created by the museum to address the deteriorating condition of objects in the collection, damages which were a result of their being stored in the London Underground tunnels during the First World War. The creation of this department moved the focus for the development of conservation theory and practice from Germany to Britain, and made the latter a prime force in this fledgling field. In 1956 Plenderleith wrote a significant handbook called The Conservation of Antiquities and Works of Art, which supplanted Rathgen's earlier tome and set new standards for the development of art and conservation science.
In the United States, the development of conservation of cultural heritage can be traced to the Fogg Art Museum, and Edward Waldo Forbes, its director from 1909 to 1944. He encouraged technical investigation, and was Chairman of the Advisory Committee for the first technical journal, Technical Studies in the Field of the Fine Arts, published by the Fogg from 1932 to 1942. Importantly he also brought onto the museum staff chemists. Rutherford John Gettens was the first of such in the US to be permanently employed by an art museum. He worked with George L. Stout, the founder and first editor of Technical Studies. Gettens and Stout co-authored Painting Materials: A Short Encyclopaedia in 1942, reprinted in 1966. This compendium is still cited regularly. Only a few dates and descriptions in Gettens' and Stout's book are now outdated.Stoner, Joyce Hill. "Changing Approaches in Art Conservation: 1925 to the present". The publication exists in two editions. The earlier one is "Scientific Examination of Art: Modern Techniques on Conservation and Analysis" and was published by the National Academy of Sciences in 2003. The later edition of the publication is "Arthur M. Sackler Colloquia: Scientific Examination of Art: Modern Techniques in Conservation and Analysis". It was published by the National Academies Press in 2005.
George T. Oliver, of Oliver Brothers Art Restoration and Art Conservation-Boston (Est. 1850 in New York City) invented the vacuum hot table for relining paintings in 1920s; he filed a patent for the table in 1937.Patent# 2,073,802 U.S. "Art of Oil Painting Restoration" , March 16, 1937. Patft1.uspto.gov. Retrieved on 2012-06-29. Taylor's prototype table, which he designed and constructed, is still in operation. Oliver Brothers is believed to be the first and the oldest continuously operating art restoration company in the United States.
The focus of conservation development then accelerated in Britain and America, and it was in Britain that the first International Conservation Organisations developed. The International Institute for Conservation of Historic and Artistic Works (IIC) was incorporated under British law in 1950 as "a permanent organization to co-ordinate and improve the knowledge, methods, and working standards needed to protect and preserve precious materials of all kinds." The rapid growth of conservation professional organizations, publications, journals, newsletters, both internationally and in localities, has spearheaded the development of the conservation profession, both practically and theoretically. Art historians and theorists such as Cesare Brandi have also played a significant role in developing conservation science theory. In recent years ethical concerns have been at the forefront of developments in conservation. Most significantly has been the idea of preventive conservation. This concept is based in part on the pioneering work by Garry Thomson CBE, and his book Museum Environment, first published in 1978.
Conservation OnLine provides resources on ethical issues in conservation, including examples of codes of ethics and guidelines for professional conduct in conservation and allied fields; and charters and treaties pertaining to ethical issues involving the preservation of cultural property.
As well as standards of practice conservators deal with wider ethical concerns, such as the debates as to whether all art is worth preserving.
Keeping up with the international contemporary scenario, recent concerns with sustainability in conservation have emerged. The common understanding that "the care of an artifact should not come at the undue expense of the environment" is generally well accepted within the community and is already contemplated in guidelines of diverse institutions related to the field.
Collections care is an important element of museum policy. It is an essential responsibility of members of the museum profession to create and maintain a protective environment for the collections in their care, whether in store, on display, or in transit. A museum should carefully monitor the condition of collections to determine when an artifact requires conservation work and the services of a qualified conservator.
A principal aim of a cultural conservator is to reduce the rate of deterioration of an object. Both non-interventive and interventive methodologies may be employed in pursuit of this goal. Interventive conservation refers to any direct interaction between the conservator and the material fabric of the object. Interventive actions are carried out for a variety of reasons, including aesthetic choices, stabilization needs for structural integrity, or cultural requirements for intangible continuity. Examples of interventive treatments include the removal of discolored varnish from a painting, the application of wax to a sculpture, and the washing and rebinding of a book. Ethical standards within the field require that the conservator fully justify interventive actions and carry out documentation before, during, and after the treatment.
One of the guiding principles of conservation of cultural heritage has traditionally been the idea of reversibility, that all interventions with the object should be fully reversible and that the object should be able to be returned to the state in which it was prior to the conservator's intervention. Although this concept remains a guiding principle of the profession, it has been widely critiqued within the conservation professionAndrew Oddy and Sara Carroll (eds). 1999. Reversibility – Does it Exist? British Museum Occasional Paper Number 135. London: British Museum. and is now considered by many to be "a fuzzy concept."
An example of a highly publicized interventive conservation effort would be the conservation work conducted on the Sistine Chapel.
Another dilemma is that many conservation-grade materials are chosen because they do not biodegrade. For example, when selecting a plastic with which to make storage enclosures, conservators prefer to use relatively long-lived plastics because they have better ageing properties - they are less likely to become yellow, leach plasticisers, or lose structural integrity and crumble (examples include polyethylene, polypropylene, and polyester). These plastics will also take longer to degrade in landfill.
In general, lowering the temperature reduces the rate at which damaging chemical reactions occur within materials. For example, storing cellulose acetate film at 10 °C instead of 21 °C is estimated to increase its usable life by over 100 years. Controlling the relative humidity of air helps to reduce hydrolysis reactions and minimises cracking, distortion and other physical changes in Hygroscopy materials. Changes in temperature will also bring about changes in relative humidity. Therefore, the conservation profession has placed great importance on controlling Building science. Temperature and humidity can be controlled through passive means (e.g. insulation, building design) or active means (air conditioning). Active controls typically require much higher energy use. Energy use increases with specificity - e.g. in will require more energy to maintain a quantity of air to a narrow temperature range (20-22 °C) than to a broad range (18-25 °C). In the past, conservation recommendations have often called for very tight, inflexible temperature and relative humidity set points. In other cases, conservators have recommended strict environmental conditions for buildings that could not reasonably be expected to achieve them, due to the quality of build, local environmental conditions (e.g. recommending temperate conditions for a building located in the tropics) or the financial circumstances of the organisation. This has been an area of particular debate for cultural heritage organisations who lend and borrow cultural items to each other - often, the lender will specify strict environmental conditions as part of the loan agreement, which may be very expensive for the borrowing organisation to achieve, or impossible.
The energy costs associated with cold storage and Digital Storage are also gaining more attention. Cold storage is a very effective strategy to preserve at-risk collections such as Nitrocellulose and cellulose acetate film, which can deteriorate beyond use within decades at ambient conditions. Digital storage costs are rising for both born-digital cultural heritage (photographs, audiovisual, time-based media) and to store digital preservation and access copies of cultural heritage. Digital storage capacity is a major factor in the complexity of preserving digital heritage such as video games, social media, messaging services, and email.
Other areas where energy use can be reduced within conservation and restoration include:
In the routine work of conservation laboratories, a series of practices can be implemented with a view to management that favors ethical sustainability criteria, as well as actions such as pragmatic responses to climate emergencies. It is fundamentally that we strive to make practices such as the following commonplace:
The document listed the following as priorities for the next decade:
The conservation profession response to this report was on the whole less than favourable, the Institute of Conservation (ICON) published their response under the title "A Failure of Vision". It had the following to say:
Concluding:
Further to this the ICON website summary report lists the following specific recommendations:
In November 2008, the UK-based think tank Demos published an influential pamphlet entitled It's a material world: caring for the public realm, in which they argue for integrating the public directly into efforts to conserve material culture, particularly that which is in the public, their argument, as stated on page 16, demonstrates their belief that society can benefit from conservation as a paradigm as well as a profession:
The university can rarely provide all the necessary training in first hand experience that an apprenticeship can, and therefore in addition to graduate level training the profession also tends towards encouraging conservation students to spend time as an intern.
Conservation of cultural heritage is an interdisciplinary field as conservators have backgrounds in the fine arts, sciences (including chemistry, biology, and materials science), and closely related disciplines, such as art history, archaeology, and anthropology. They also have design, fabrication, artistic, and other special skills necessary for the practical application of that knowledge.
Within the various schools that teach conservation of cultural heritage, the approach differs according to the educational and vocational system within the country, and the focus of the school itself. This is acknowledged by the American Institute for Conservation who advise "Specific admission requirements differ and potential candidates are encouraged to contact the programs directly for details on prerequisites, application procedures, and program curriculum".
In France, training for heritage conservation is taught by four schools : , L'École supérieure des Beaux-Arts Tours, Angers, Le Mans, L'Université Paris 1 Panthéon-Sorbonne, Institut national du patrimoine.
The built heritage was at the forefront of the growth of member based organizations in the United States. Preservation Virginia, founded in Richmond in 1889 as the Association for the Preservation of Virginia Antiquities, was the United States' first statewide historic preservation group. APVA Preservation Virginia . Apva.org. Retrieved on 2012-06-29.
Today, professional conservators join and take part in the activities of numerous conservation associations and professional organizations with the wider field, and within their area of specialization. In Europe, E.C.C.O. European Confederation of Conservator-Restorers Organisations was established in 1991 by 14 European Conservator-Restorers' Organisations. Currently representing close to 6.000 professionals within 23 countries and 26 members organisations, including one international body (IADA), E.C.C.O. embodies the field of preservation of cultural heritage, both movable and immovable.
These organizations exist to "support the conservation professionals who preserve our cultural heritage". About AIC – Overview. Conservation-us.org. Retrieved on 2012-06-29.
This involves upholding professional standards, promoting research and publications, providing educational opportunities, and fostering the exchange of knowledge among cultural conservators, allied professionals, and the public.
| 1931 | Athens Charter | International Congress of Architects and Technicians of Historic Monuments | text |
| 1931 | Carta Di Atene | Conferenza Internazionale di Atene | text (Italian) |
| 1932 | Carta Italiana del restauro | Consiglio Superiore Per Le Antichità e Belle Arti | text (Italian) |
| 1933 | Athens Charter | IV CIAM | text |
| 1956 | New Delhi Recommendation | IX UNESCO | text, text |
| 1962 | Paris Recommendation | XII UNESCO | text |
| 1964 | Venice Charter | II International Congress of Architects and Technicians of Historic Monuments | text, text |
| 1964 | Paris Recommendation | XIII UNESCO | text |
| 1967 | Norms of Quito | OAS | text (Spanish), text |
| 1968 | Paris Recommendation | XV UNESCO | text |
| 1972 | Paris Convention | XVII UNESCO | text |
| 1972 | Paris Recommendation | XVII UNESCO | text |
| 1972 | Carta Italiana del Restauro | text (Italian) | |
| 1972 | Stockholm Declaration | UNEP | text |
| 1974 | Santo Domingo Resolution, Dominican Republic | Interamerican Seminar on the Conservation and Restoration of the Architectural Heritage of the Colonial and Republican Periods – OAS | text (Portuguese), text (Portuguese) |
| 1975 | Declaration of Amsterdam | Congress on the European Architectural Heritage | text |
| 1975 | European Charter of the Architectural Heritage | Council of Europe | text |
| 1976 | Charter on Cultural Tourism, Brussels | International Seminar on Contemporary Tourism and Humanism | text |
| 1976 | Nairobi Recommendation | XIX UNESCO | text |
| 1977 | Machu Picchu Charter | text (Portuguese), text (Portuguese), text (Spanish), ref (Spanish) | |
| 1981 | Burra Charter | ICOMOS | text |
| 1982 | Florence Charter | ICOMOS: Historic Gardens | text, text |
| 1982 | Nairobi Declaration | UNEP | text |
| 1982 | Tlaxcala Declaration | ICOMOS | text |
| 1982 | México Declaration | World Conference on Cultural Policies – MONDIACULT | text, text |
| 1983 | Declaration of Rome | ICOMOS | text |
| 1987 | Carta della conservazione e del restauro degli oggetti d'arte e di cultura | text (Italian) | |
| 1987 | Washington Charter | ICOMOS | text, text |
| 1989 | Paris Recommendation | XXV UNESCO | text |
| 1990 | Lausanne Charter | ICOMOS / ICAHM | text, text |
| 1994 | Nara Document | UNESCO / ICCROM / ICOMOS | text, text |
| 1995 | European Recommendation | Council of Europe, Committee of Ministers | text (Rec(95)3E), text (Rec(95)9E) |
| 1996 | Declaration of San Antonio | ICOMOS | text |
| 1997 | Declaration of Sofia | XI ICOMOS or XXIX UNESCO | text |
| 1997 | Carta de Mar del Plata | Mercosur | text (Portuguese), text (Portuguese), text (Spanish), text (Spanish) |
| 2000 | Cracow Charter | text (Italian) | |
| 2002 | Declaration of Cartagena de Indias, Colômbia | Conselho Andino, OAS | text |
| 2003 | Paris Recommendation | XXXII UNESCO | text |
| 2017 | Delhi Declaration | ICOMOS | text (English) |
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