Research papers already published:

• Paper as Evidence - originally lectured for the IPH-congress in Poland, September 2004.
  Authentication is practised as part of source criticism by all historical disciplines. It is commonly considered that there are no practical rules applicable to all individual cases. However, some general principles of action exist and researchers meet similar problems in different contexts. The authors want to make a plea for an approach in which all types of relevant evidence are used.
  Read the report as pdf (English, 10 pages, 500 kB).
• Toorop or Hall - investigation on the material of an oil painting on paper board, October 2003.
  Object of investigation in this study is an oil painting on paper board signed 'Jan Toorop'. The authenticity of this painting could not be decided by art historians on stylistic criteria only. In our research the pigments and board are identified by scientific and historical methods. The board could be dated to the 1880s; a similar board was used in a painting by Toorop from that period. The presence of a second signature by Ann Hall, Toorops wife, made the authorship of Jan Toorop unlikely though some kind of cooperation between the two could neither be proved nor disproved.
  Read the report as pdf (Dutch, 22 pages, 650 kB). The pictures in this report, can be viewed or downloaded apart from the report (as ZIP file: 2,3 mB or as RAR file: 2,2 mB).
• Study on the paper support of a possible Renoir pastel - historic-technical and chemical investigations, December 2002.
  This report describes a multidisciplinary study into the paper support of a pastel signed 'Renoir'. The authenticity of this pastel is questioned. The investigation of the paper involved historical, technical and chemical data. The pastel support appeared to consist of a special, late nineteenth century transfer paper. Transfer paper, as well as other related paper types from the graphic industries, were available to and used by Renoir and other contemporary impressionists.
  Read the report as pdf (English, 30 pages, 4,1 mB). The pictures in this report are in black-and-white, they are in color viewable or downloadable apart from the report (as ZIP file: 1,1 mB or as RAR file: 1,1 mB).