This video documents the extensive, multi-year conservation project of Michelangelo's "Epiphania" cartoon at the British Museum. As one of only two surviving cartoons by the artist, the large-scale charcoal and black chalk drawing on 26 sheets of paper was found to be degrading due to acidic compounds from its 19th-century glue and mounting panel. The meticulous restoration involved scientifically controlled methods, including careful separation from its old mount, consolidation of the fragile media, painstaking removal of historic backing papers and adhesives using advanced gel technology, widespread repairs and infills using traditional and modern materials, and structural relining with multiple layers of Japanese paper. The cartoon was then mounted onto a custom-designed, inert aluminum honeycomb panel and encased within a new, environmentally controlled frame, ensuring its long-term preservation and allowing its subtle details to be safely displayed.
The Meticulous Conservation of Michelangelo's "Epiphania" Cartoon
0:00 Introduction to "Epiphania": The video introduces Michelangelo's "Epiphania," one of only two surviving cartoons by the artist, highlighting its fragility and the complex logistical challenge of turning it over.
0:14 Identification of Degradation: Scientific research in 2006 revealed that old glue and lining from its 19th-century mounting were breaking down into acidic compounds, slowly degrading the precious artwork.
0:26 Conservation Project Commencement: The conservation project began in 2014, necessitated by the opening of new, spacious studios at the British Museum.
0:55 Rarity and Construction: Senior conservator Emma Turner explains that "Epiphania" is a 1:1 scale preparatory drawing, composed of 26 overlapping paper sheets, drawn in black chalk and charcoal.
1:37 Damage from Pinewood Panel: The original 19th-century pinewood panel was identified as the primary cause of the paper's brittleness, weakness, and extensive discoloration.
2:09 Comprehensive Documentation (2019): Before treatment, the cartoon underwent thorough digital documentation, including 3D topography scanning, multi-light photography, and digital condition mapping, to understand its state and reveal hidden features like watermarks.
2:38 Exhibition-Driven Timeline: The conservation was accelerated in late 2022 for the "Michelangelo: The Last Decades" exhibition, which united "Epiphania" with its corresponding panel painting for the first time since the 16th century.
3:23 Lifting from Panel: The first step involved carefully cutting and removing layers of paper and canvas from the front to separate the cartoon from its damaging original mount.
3:36 Assessing the Verso: The cartoon was turned over to assess its back (verso); the media was stable, but the paper surface was fragile.
3:54 Consolidation with Gelatine: A dilute gelatin spray was applied to the fragile paper surface using an airbrush to consolidate the media and reintroduce strength to the paper structure, consistent with traditional sizing.
4:31 Complex Turning Operation: Due to the cartoon's size and fragility, turning it over required sandwiching it between soft and inert layers within rigid boards, demanding hours of preparation and a team of eight conservators for each maneuver.
5:03 Discovery and Removal of Backing Paper: The verso was found entirely covered with a weak, discolored 19th-century brown backing paper, which was determined to be removed. This was a seven-month process.
5:22 Controlled Moisture Removal with Gels: To remove the backing paper without damaging the cartoon, controlled moisture was applied using chemical hydrogels (similar to contact lens technology), allowing for precise softening of the paper and adhesive.
6:10 Painstaking Manual Removal: The removal was extremely meticulous, using tweezers, spatulas, and blunted scalpels. Numerous historic tears were temporarily supported with Japanese paper splints to maintain alignment.
6:50 Unveiling and Analysis of Adhesive Layers: The removal revealed impressions of two earlier canvas linings and confirmed the presence of at least three layers of old starch and protein-based glues, which had caused significant discoloration and brittleness.
7:53 Thinning Adhesives and Widespread Repairs: Due to inherent degradation, the adhesive layers were thinned rather than fully removed. Extensive tears and losses were repaired using thin, strong Japanese mino paper (some pre-dyed) and reversible, gluten-free wheat starch paste, with custom lead shot weights for pressing.
9:29 Structural Relining of the Verso: The verso was relined with three layers of Japanese Mino paper in collaboration with specialist conservators for Eastern Art. The process involved applying smaller pieces for the first layer, gradually increasing paper weight, and rotating grain direction to prevent curling.
10:37 Addition of Margin: A margin of paper was added around all four edges of the cartoon to stabilize them and create a border for the new frame.
11:51 Final Lining Layer: The heaviest Mino paper was applied in eight full-width rows, a precise operation requiring the support of the entire conservation team to ensure even humidity and adhesion.
12:32 Most Complicated Turning Operation: The final turn, from verso-up to recto-up (face up) for drying, was the most complex. A new method using a rigid board and fabric secured with bulldog clips was devised to prevent creasing of the wet, vulnerable paper.
13:43 Tension Drying and Recto Treatments: The cartoon was attached to a wooden drying board to dry evenly under tension, achieving optimal flatness. Final treatments on the recto included adhering lifting areas and meticulous color-matching of infills using watercolors.
14:39 New, Inert Mounting Panel: The original pine panel was replaced with a custom-fabricated, inert, and rigidly flat aluminum honeycomb panel, covered with 100% cotton rag museum board, developed in collaboration with London's National Gallery.
15:47 Final Mounting Process: The cartoon was mounted to the new panel using a 3D rayon mesh laminated with Japanese paper and starch paste, carefully wrapped around the panel to hold the cartoon under light tension and ensure flatness.
16:54 First Upright Viewing (Since 2018): Moving "Epiphania" to an upright position for the first time since 2018 allowed conservators to assess and adjust infill toning under exhibition lighting, significantly improving the overall presentation.
17:41 New Environmentally Controlled Frame: A two-part frame, comprising a glazed aluminum display case and a decorative wooden veneer frame, was designed to provide stable environmental control, crucial for long-term preservation.
18:18 Exhibition and Permanent Display: After its initial display in a temporary exhibition, "Epiphania" was moved to its permanent location in Gallery 9A, encased in its new, 16th-century-inspired frame.
19:01 Challenging Installation: The permanent installation was a major logistical undertaking due to the cartoon's 250 kg weight, requiring scaffolding, a pedestrian stacker, and a custom steel framework to secure it to the wall.
20:30 Significant Achievement: The conservation of "Epiphania" is highlighted as the greatest technical challenge for the team, resulting in improved visibility, evened paper tone, and crucial removal of degrading materials, marking a profound career highlight.