Beyond the connoisseurship approach: creating a chronology in Hokusai prints using non-invasive techniques and multivariate data analysis

This study combines scientific and connoisseurship approaches to establish a production chronology of 141 woodblock prints from Katsushika Hokusai’s series Thirty - Six Views of Mount Fuji belonging to different cultural institutions in Europe and the United States. In order to create this chronology, the reflectance spectroscopy (FORS) signature of the indigo/Prussian blue mixture of the key-block printed outlines was measured and compared using multivariate data analysis. This approach yielded 9 clusters of prints, each one presenting slightly different FORS features, and therefore, different Prussian blue/indigo mixtures. The connoisseurship approach was then applied to impressions of the same print found across the 9 clusters. This allowed for arrangement of the clustered prints according to their production time, resulting in a comprehensive timeline for the 141 prints examined. To date, this work represents the only systematic study of such a large corpus of Japanese/Hokusai woodblock prints integrating chemical analysis and statistical treatment of data with careful visual examination of the prints. The result is a novel approach to creating a chronology for these objects. Our study easily differentiated between early nineteenth and early twentieth century prints as well as between various printing batches/clusters. Creating a chronology of such an important print series is also crucial to understand the evolution of artist and printing studio practices in late nineteenth-century Japan, a period of great economic and cultural changes.