The outer panels of the Ghent Altarpiece had been overpainted to a considerable extent. The virtuosity of the Eyckian technique and aesthetics remained hardly visible. And yet, this had never been observed before the start of the conservation treatment. By removing the overpaint, the tonal richness and the coherent rendering of light and space once again came to the fore. Especially the suggestion of volumes and the spaciousness of the ensemble gained strength because of the virtuoso play of deep shadows and bright light accents, and not in the least because of the surprising trompe-l'oeil effect of the frames conceived as a stone framework. Or to put it in the words of the comments of one of the experts, dr. Maryan Ainsworth: The paintings live and breathe again in the time of the Van Eyck brothers. The sharp observation skills, the quick, accurate execution, the knowledge, curiosity and ingenuity about all the things that are depicted, are now unveiled after centuries. The profit for the knowledge of and further research into the essence of Eyckian aesthetics is considerable. And finally there is the discovery that the much-discussed quatrain was applied simultaneously with the polychromy of the frames: a real 'coup de foudre' in the discourse of the current art-historical research! The subtleties of the Eyckian technique could also be mapped out in more detail. How the Van Eycks managed to keep the final result and the desired effect in mind during every phase of the execution, from imprimatura to finishing touch. The artists made a statement about the art of painting, giving ?technique? as such a new prominence. The Ghent Altarpiece may be understood at some point as a major showpiece for a highly sophisticated pictorial technique. We hope that this publication of the results of the research and conservation campaign on the exterior of the altarpiece can help future researchers to ask better questions. Questions, and answers, that may produce a more balanced picture of Van Eyck's techniques, methods and materials. Table of Contents Foreword Ludo Collin Preface Hilde De Clercq, Christina Ceulemans Introduction Maximiliaan Martens, Christina Ceulemans, Ron Spronk, Anne van Grevenstein-Kruse Transformations in the Sixteenth and Seventeenth Centuries H l ne Dubois Frames and Support: Technique and Structural Treatment Jochen Ketels, Jean-Albert Glatigny, Anne-Sophie Augustyniak Paint and Polychromy: Chemical Investigation of the Overpaints Jana Sanyova, Geert Van der Snickt, H Koen Janssens, Peter Vandenabeele Conservation and Restoration Treatment The Painted Surface Livia Depuydt-Elbaum, Fran The Frames: In Search of Lost Unity Anne-Sophie Augustyniak, Laure Mortiaux The Van Eycks' Creative Process The Paintings: from (Under)drawing to the Final Touch in Paint Marie Postec, Griet Steyaert The Frames: an Exceptional Polychromy Anne-Sophie Augustyniak, Laure Mortiaux, Jana Sanyova The Authenticity of the Quatrain and the other Frame Inscriptions Susan Frances Jones, Anne-Sophie Augustyniak, H l ne Dubois Imagining the Original Display Bart Fransen, Jean-Albert Glatigny Restoring in the Public Eye Bart Devolder Epilogue: Implications and Perspectives Cyriel Stroo, Maximiliaan Martens Documentation Photography before and after Treatment St phane Bazzo, Jean-Luc Elias, Katrien Van Acker Inscriptions on the Exterior Susan Frances Jones, Marc H. Smith The Quatrain: a New Reconstruction Marc H. Smith, Susan Frances Jones, Anne-Sophie Augustyniak Dimensions of Frames and Supports Jochen Ketels, Jean-Albert Glatigny, Anne-Sophie Augustyniak The Ghent Altarpiece: a Bibliography Dominique Deneffe, Jeroen Reyniers Bibliography Project Participants Photographic Acknowledgements Abbreviations Index of Names Index of Works of Art