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Color, collation, and curious creatures: a technical study of 15th-century block books at The Morgan Library & Museum

The Morgan Library & Museum, New York, owns one of the largest and most prestigious collections of block books in the world, most of which are attributed to the Netherlands and Germany and dated to ca. 1460–1490. Block books are rare examples of early multi-page works produced entirely from hand-colored woodcuts, with both imagery and text carved in relief from a single block. Although created for only a few decades in the late 15th century, block books are relevant in that they represent an alternative production method to the coeval invention of typographic printing, which, upon introduction, quickly dominated the book market. As little is known about the composition of early printing inks and, more broadly, of the materials constituting these unusual objects, an extensive campaign of scientific analysis was undertaken using various non-invasive and micro-invasive techniques. Examination of the paper and watermarks provided information regarding provenance and dating of the books. Their polychrome imagery was found to have been created through a widespread use of both mineral pigments and natural dyes, often present in complex mixtures and applied in various ways. Similarly, the printing inks typically consist of combinations of carbon-based and iron gall inks, sometimes mixed with red mineral pigments likely to adjust their hue. In a few cases, modern pigments were also identified on inserted replacement pages, pointing to later interventions. This research has substantially enriched the current knowledge of the materials and techniques employed in block books and securely links them to single-leaf woodcuts of the 15th century, placing them in a medieval illumination tradition.

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Mixing, dipping, and fixing: the experimental drawing techniques of Thomas Gainsborough

The Morgan Library & Museum, New York, owns twenty-five works on paper by the 18th-century English artist Thomas Gainsborough. Scholarly publications over the past 20 years, as well as Gainsborough’s own writings, have highlighted his proclivity toward innovative methods and experimentation. In particular, a letter that the artist wrote in 1773 reveals details of his secret recipe for making oils on paper, such as his recommended use of lead white and the unorthodox practice of dipping his works in skim milk, possibly to prevent the pigments from discoloring. About a dozen of Gainsborough’s creations were included in a 2018 exhibition at The Morgan entitled Thomas Gainsborough: Experiments in Drawing. On this occasion, an in-depth scientific study aimed to explore the artist’s work as a draftsman, with a special focus on his mastery of materials, his technical innovations, and his development of an original approach to drawing. Initially, a selection of artworks was examined using magnification along with transmitted and raking light to improve surface visualization and to investigate the structure of each piece. Further photographic documentation with ultraviolet and infrared light was performed to gather preliminary information on the variety of white pigments employed, on the wet and dry chalk techniques used in certain works, as well as on the possible presence of coatings and underdrawings. Subsequently, scientific analysis by means of X-ray fluorescence (XRF) and Raman spectroscopies aimed at characterizing the white pigments present in The Morgan’s drawings, which mostly consisted of calcite and lead white. Moreover, a combination of advanced micro-sampling tools, i.e. polyvinyl chloride (PVC)-free erasers and fine polishing films, ad-hoc sample preparation methods, highly sensitive proteomics analysis via nano-liquid chromatography/mass spectrometry (nano-LC/MS), and sophisticated bioinformatics data processing was employed to assess Gainsborough’s use of skim milk as a “secret fixative” on some of his works. Results have revealed the presence of specifically bovine milk in all of the samples evaluated to date. Notably, only through the combined use of such advanced technical resources can the interrogation of all milk proteins retrieved from the samples provide evidence for the presence of a milk fixative and open the discussion about milk processing methods in the 18th century. In addition to granting conservators and art historians a deeper understanding of the complexity of Gainsborough’s drawing techniques, this study paves the way for further investigations to probe the use of casein-based fixatives by other artists working on paper such as Degas and Van Gogh.

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