• The Research Agenda 2008-2012 includes  five research programmes focussing on collection-management. Their binding factor is ‘valuation’.

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  • Program

    Value and valuation

    Development of methods and techniques to objectify the value and appreciation of cultural heritage.

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    Under 'valuation' in relation to heritage we mean making substantiated and verifiable statements about the value of an object or a collection, based on a question falling under an appropriate frame of reference and concerning certain stakeholders. Predetermined and predefined criteria are applied.

    This explicit defining of an assigned value is necessary to steer preservation, development and utilisation and to enable a societal basis for heritage to emerge. After all, who determines the value of the collection now that the 'expert' no longer counts as the sole authority? How do you valuate an object or collection if there is no objective measurable value? How do you provide sufficient societal support for heritage at a time when the cultural sector is under pressure?


    The Value and Valuation programme aimed to make the various players in the heritage field (owners, managers, policy makers and funders) aware of the importance of the intrinsic (non-financial) value and valuation of cultural heritage, and to develop methods and techniques to attribute value to objects and collections. As valuation benefits from a broad interdisciplinary approach, the emphasis lay on dialogue and collaboration with external partners. A new system was developed in close consultation with the museum world to facilitate the process of value attribution. This has resulted in the publication of On the museum scales: collection valuation in six steps.

    Independent valuation

    This practical guide takes the user through the valuation process step-by-step and results in a description of object/collection significance, a valuation ranking or grouping, or an investment plan. With well-founded arguments it is possible to explain to others the value of an object or collection and the reasons for the value. This facilitates decision-making on interventions, making conflicting interests negotiable and making stories behind the collection accessible.

  • Program

    Collection Accessibility

    Research into the effectiveness of methods and means to make heritage and related knowledge accessible online.

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    New media forms a tempting alternative to traditional analogue guides for the public as staff and resources in museums are generally scarce. But do they function as well or better than gallery texts, guided or audio tours?

    Are some applications more effective than others? Are there any applications that actually generate more visitors, and if so, which?


    The Accessibility programme focused on the effectiveness of virtual resources to make heritage visible and to interest new types of public. Possibilities include apps, 3D and AR techniques, and also social media like Facebook and YouTube. But what to choose from the overwhelming number of new techniques?


    The RCE carried out an inventory to provide collection managers with an understanding of the developments and possibilities of new media (and the institutions that can assist in developing applications). This also aimed to chart the applications most effective for specific objectives for both content and generating visitors. The projects on which these questions were tested were diverse in nature:

    • Conservation of two textile objects of polypropylene. In this project, the practical applicability of conservation knowledge about polypropylene was tested. In addition a conservation treatment of polypropylene was recorded for educational objectives and the conservation file placed online. As a result, both the object and the information are permanently accessible for consultation by collection managers and conservators.
    • Imago revisited: research into two installations in a case study using good practice (developed during the Inside Installations project) regarding the daily and long-term management of complex (multimedia) installations.
    • Generating and sharing knowledge online about the conservation of contemporary art in the two-year European project PRACTICs by museums, institutes and universities. Associated with this was a public testing of the film Installation Art: Who Cares? as an educational tool, to investigate how much visitors appreciated having a look 'behind the scenes'.
    • CARTA project, an inventory of documentation projects and documentation systems with which research findings are linked to locations and artworks.
    • Inventory of the operation of two thematic networks (INCCA Education and Postdoc Network) under INCCA.
    • Archiving the website with all details of the Inside Installations project, the preservation and presentation of Installation Art Project (2004-2007), a research into the re-installation and documentation of 33 complex multimedia installations.
    • Participation of the RCE as a research partner in the pilot project of MuseumApp, under which the effectiveness of this app for heritage institutions was studied.
    • Development of guidelines to increase the effectiveness of museum institutions online.
  • Program

    Object in context

    Enrichment of the object in its context on the basis of technical art history and research, for the benefit of its conservation and restoration.

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    Objects that have been handed down to us from the past can tell a story of their history of creation and how they have changed over time.

    The Object in Context programme makes such stories accessible through research on the material object and its contextual clues (historical evidence). In addition, the program focuses on questions concerning the restoration and conservation of a range of objects, from classical antiquity to contemporary art, from paintings and textiles to metal and plastics.


    Under Object in Context, analytical chemistry researchers and forensic specialists delve into cause and effect. Besides a keen eye for detail, they employ a research laboratory and technological methods that enable the visualization of evidence visible only at a molecular level. Although analytical research often forms the basis for research, collaboration with other disciplines, such as art and cultural history, is always sought as well.

    Arts meets sciences

    A connecting link between the many projects under Object in Context is the extent to which ageing is regarded as acceptable. That limit of acceptance is subjective and cannot be considered purely from the material-technical perspective. Thus the theme of 'perception of the surface' is key in several projects. This involves coupling the scientific 'looking' through apparatus with subjective, human visual perception.

    Download here the comprehensive introduction to the Object in Context program, including an introduction to the projects in PDF.

  • Project

    European collaboration in the field of the conservation and restoration of cultural heritage.

  • Project

    Manufacture, consolidation, cleaning and use of plaster casts, models and objects.

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    Cleaning unvarnished painting surfaces from the 20th century.

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    The painting methods of Rembrandt's pupil, Govert Flinck.

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    Artist Interviews as an essential source of information for the conservation of contemporary art.

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    The inventory of damages and problematic situations of art in public spaces.

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    The use of natural dyes on textiles and furniture.

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    New Strategies in the Conservation of Contemporary Art.

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    The degradation and conservation of plastics.

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    How to conserve cellulose acetate (CA) art works, based on the case study of two plastic (CA) books.

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    Degradation of polyurethane (PUR) elastomers: research into properties, degradation and conservation treatments.

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    The conservation of art works of broken, transparent, unsaturated polyester and polymethyl methacrylate.

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    Preservation OPlastic ARTefacts in museum collections.

  • Project

    Influence of objective and subjective aspects in decision-making about the cleaning of objects.

    The aim of the project was to help conservators determine whether a cleaning method is 'safe' for specific object types and materials, such as acrylic paint, daguerreotypes, face-mounted and laminated photographs and silver.

    Daguerreotype NFM

    Daguerrotype of the Netherlands Photo Museum (NFM)

    The project was carried out both on 'objective' results of technical studies, and on the 'subjective' observation and perception of the conservator, the scientist and the viewer.


    A recurring question with the conservation of objects is the effect of the cleaning process (or the treatment process in general) on the appearance and the possible changes in perception and readability.

    Objective and subjective approach

    The perception of an object depends on chemical and physical properties. On the one hand there is the surface (colour, roughness/texture, shine, effect of transparent layers, craquelure, influence of lighting, etc.), i.e., the objective approach. On the other hand there is the context in which the object was created, is exhibited and viewed (perception, visibility of a particular change, how the change affects the readability of the object, etc.), i.e., the subjective approach.


    For the correct choice of a cleaning method for a particular object, it is important that both the objective and the subjective approach are considered in the decision-making. On the basis of this and other information it can then be decided how a conservator could treat an object and whether the object may/can/should be treated at all.

    Socratic dialogue

    To answer these questions and make decisions it is necessary that one is aware of the objective and subjective aspects. A number of case studies were carried out to demonstrate this approach and, at the same time, arrive at concrete results that conservators can utilise. Hereby the Socratic dialogue was put to use. This involves creating a 'safe' environment for participants to discuss and explore the various aspects of conservation decisions and ethics.

    Case Studies

    This project involved case studies from the projects below:

    • Treatment of face-mounted and laminated photos
    • Conservation of 'community art'
    • Electrochemical cleaning of daguerreotypes
    • Conservation of paintings (RCE collections)
    • Cleaning acrylic paint



    Berg, K. J. van den, M. Daudin, I.  Joosten, W. Wei, R. Morrison, A. Burnstock, ‘A comparison of light microscopy techniques with scanning electron microscopy for imaging the surface cleaning of paintings’, in: Proceedings of 9th International Conference on NDT of Art -  ART 2008 (Jeruzalem), 25-30 mei 2008.

    Mirabele, A. en Wei, W., ‘La misura della rugositá e della topografia della carta come método per distinguere le arti grafiche a tiratura multipla’, in: Proceedings Congresso Nazionale Annuale IGIIC: Lo Stato dell’Arte 8, 16-18, september 2010 (Venetië), 2010.

    Wei, W., ‘Fingerprinting objects for the control of illegal trafficking’, ARCA 2012 Annual Art Crime Conference, Amelia, Italy, issue 8, 23-24 juni 2012, Association for Research into Crimes against Art (ARCA), 2012, pp. 65-77.

    Wei, W, Surface micro-roughness, cleaning, and perception, Proceedings of the ICOM-CC 16th Triennial Meeting, Lisbon, Portugal, 19-23 september 2011 (Lissabon), 2011.

    Wei, W., ‘International research on the conservation and restoration of face-mounted photographs’, in: Proceedings of the ICOM-CC 15th Triennial Meeting, Vol. 1, Allied Publishers Pvt Ltd (New Delhi), 22-26 september 2008, pp. 709-715.

    Wei, W., V. Bakker, J. Frohn, S. Goodall, A. Lagana, K. Martinez, S. Sotiropolou, A. Walther, G. Wiora en M. Weber,‘A semi-automatic system for the non-contact 'fingerprinting' of objects of art and cultural heritage’, in: Proceedings of the ICOM-CC 15th Triennial Meeting, Vol. 1, Allied Publishers Pvt Ltd (New Delhi), 22-26 september 2008, pp. 376-380.

    Wei, W., A. De Tagle en IJ. Hummelen, ‘Three dimensional documentation of "two dimensional" works of art’, in: Proceedings of the 17th International Conference on Photonics in Europe: Optical Metrology Optical Measurement Systems for Industrial Inspection - Optical Methods for Arts and Archaeology (München), 12-16 juni 2005, p. 1005.

    Wei, W., J. Frohn, S.  Sotiropolou, en M. Weber, ‘Experience with a New Non-Contact Fingerprinting Method for the Identification and Protection of Objects of Cultural Heritage Against Theft and Illegal Trafficking’, in: Proceedings of the CSSIM conference "Conservation Strategies for Saving Indoor Metals Collections", satellite conference - Legal Issues in the Conservation of Cultural Heritage (Cairo), 25 februari - 1 maart 2007, Technological Educational Institute of Athens, pp. 217-222.

    Wei, W., Z. Benders and E. Domela-Nieuwenhuis, "Restoration ethics, cleaning and perception - case studies from the Dutch government collection", in: Ethics & Critical Thinking in Conservation, American Institute for Conservation, (Washington D.C.) 2012, Chapter 8, pp. 218-222.

    Wei, W., I. Gerritsen en C. von Waldthausen, 'Re-examining the (Electro-)Chemical Cleaning of Daguerreotypes. Microscopic Change vs. Macroscopic Perception', Topics in Photographic Preservation, Vol 14, Photograph Materials Group of the AIC, (Washington D.C.), 2012, pp. 24-40.

    Wei, W. en C. von Waldthausen, 'Spiegeltje aan de wand'Kunst en Wetenschap, 4 (2009-2010), pp. 37-38.


    Gerritsen, I., Chemisch reinigen van een daguerrotypie, afstudeerfilm, 2012. 


    Bill Wei

    Team members

    Zeph Benders, Eric Domela-Nieuwenhuis, IJsbrand Hummelen, Ineke Joosten, Ron Kievits, Thea van Oosten, Tatja Scholte, Simone Vermaat


    Artesis Hogeschool, Antwerpen; Fotomuseum Antwerpen, Fotowerkgroep (voor Nederlandstalige fotorestauratoren), S. Frieling (organisatieadviseur), Het Nieuwe Trivium, Eindhoven, Metropolitan Museum Art, New York; A. Mirabele (restaurator), Parijs; Nederlands Fotomuseum, Den Haag; Fotorestauratieatelier C.C. von Waldthausen, Amsterdam; TU Delft, Universiteit Maastricht

  • Project

    Research into archaeologic and historic objects.

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    Fabrication techniques and conservation of archaeological metals.

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    Origin of red garnets in early medieval jewellery in the Netherlands.

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    Fabrication and origin of magnetic cannons, White Delft and a shipload of semi-finished articles.

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    Van Gogh's work process in the context of his time.

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    Mondriaan's Victory Boogie Woogie: his last work under the microscope.

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    Research into the history and application of early synthetic dyes.

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    Causes of water sensitivity in the oil paints of 20th century paintings.

  • Program


    Quantitative research on composition, use and policies concerning museum collections.

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    In the museum sector, procedures and processes of collection management are analysed using figures and indicators to only a limited extent. As a result, decisions are often based on impressions or tradition.

    Ad hoc quantitative analyses have been performed in recent years. Again and again it has proved difficult to generate reliable figures.


    When comparing museums it was also revealed that the number of variables arising form an almost insurmountable barrier for benchmarking. The RCE therefore opted for a structural, long-term program with the focus on a statistical approach to research questions concerning collection management.


    Under the Museometry programme, quantitative research is conducted on the composition, use and exploitation of museum collections. Trends and developments are distilled from the collected facts and figures on museum collections (museometry). The resulting figures and analyses are made available for the museum professionals and managers responsible for museum collections. In turn, they use this quantitative data for the formulation of various policies concerning these collections. In this way museometry contributes to evidence-based management (EBM) in the museum sector.


    Projects under this program include:

    • The Loan Monitor: a website that visualises on a map loan movements between national and international museums for exhibitions.
    • The Modern Art Collection Audit (CMBK), a statistical analysis of how Netherlands museums have collected modern art from 1999 to 2009. The database, comprising acquisition data from about 40 museums with relevant collections of modern art, makes statistically based statements possible about the collection policy of the museums.
    • The 20th century Artist Index, in which major artists are inventoried from the period 1870 to the present.
    • Completion and verification of available data on international collection mobility, accessibility and cultural participation arising from the implementation of the indemnity scheme.
    • An inventory and analysis of museum annual reports.
  • Program

    Collection Risk Management

    A user-friendly method for heritage managers to assess and manage risks themselves.

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    The Collection risk management (CRM) program is aimed at minimizing the loss of value at the interface between preservation and use. The existing CRM methodology has been tested in different situations, developed and simplified in order to bring it within reach of smaller institutions with limited time and resources.

    To this end, new instruments were developed and information necessary to quantify the various risks was generated and made available in the convenient form of a digital manual. The program concluded with an international meeting on risk management.


    Risk management examines all the threats to which collections are exposed and combines preventive conservation, security and facility management. This forms the next step in the professionalization of collection preservation and management. In applying this strategy, the risks for a collection are identified, analysed and evaluated. These risks can then be compared on the basis of the expected value loss over a given period (risk assessment) and ranged to set priorities for measures to reduce this loss of value. This aids the collection manager in making informed and substantiated choices in the deployment of the often limited resources available to collection management.


    Under the CRM program, the methodology was tested in case studies, courses and workshops, then further developed and simplified so that smaller institutions with limited time, resources and knowledge can also gain insight into their own situation. To this end knowledge must be generated to qualify or quantify the various risks and ultimately made available in a usable form. This process was carried out in a number of projects under the program. Knowledge development and deployment of the indemnity scheme also fell under this program. The field of security risks and calamities was covered in collaboration with the Safe Heritage programme.


    The before-mentioned knowledge and instruments are for the most part collated in the Digital Collection Risk Management Manual. This describes the methodology step-by-step, provides instruments for conducting a risk analysis and sets out the available information on the ten most important damage factors. In this way, the user is able to carry out a risk analysis with their team. The Manual helps in formulating the right questions for external experts.

    Risk analysis

    Two projects under the program were intended to generate data to aid in assessing risk scenarios and to determine extent of risk. On the one hand quantitative information was collected for events that could lead to loss of value (damage factors of fire, theft and vandalism, mechanical forces and water), and on the other, degradation processes (damage factors of climate, light, mechanical forces vibration and air pollution/dust). In addition, a model was developed under the Cost Effectiveness project for determining the cost-effectiveness of conservation measures.

    Research on Paper

    Finally the Metamorfoze project (National Programme for the Conservation of Paper Heritage) sought solutions for the preservation and treatment of original paper documents. The research focused on inherent deterioration such as ink corrosion, the usefulness (or uselessness) of air purification in depots and the development of a portable instrument for the on-the-spot determination of light sensitivity of objects.

    The CRM programme concluded in 2012 with the meeting Reducing Risks to Heritage in collaboration with ICCROM and CCI.