Stratigraphical Mapping and High Renaissance Paint Architecture
The micro-stratigraphical evaluation of Version 1 (the investigated Domitian painting), initiated through microscopic cross-sectional profiling by paintings conservator Nina Olivier in June 2023, provides an essential preliminary roadmap of the painting’s internal architecture.
Due to the extreme age and physical brittleness of the old paint film, several core micro-samples experienced structural parting during extraction, resulting in incomplete cross-sections across some analytical nodes. However, where the complete layer sequence remained intact, the physical evidence provides highly significant diagnostic data regarding the artwork’s authentic Renaissance lineage.
The Toned Non-White Ground System
Despite the challenges of sample fragmentation, successful cross-sections extracted from major compositional areas (including Sample 2 from the cloak and Sample 5 from the laurels) definitively isolate a distinct, non-white foundation system:
Verified Red-Brown Ground Matrix: Across the surviving complete stratigraphies, the primary ground layer is identified as a rich pinkish-red or dark brown earth layer.
Absence of Traditional Gesso: Crucially, no traditional, bright white calcium carbonate-based gesso ground was detected beneath the primary design layers.
The presence of this localized red-brown or dark earth-toned foundation (imprimitura) carries immense historical weight. Developed and popularized within the elite North Italian circles of Leonardo da Vinci at the turn of the 16th century, this specific technical innovation allowed painters to abandon the flat, reflective white grounds of the Middle Ages. The dark, preparatory tone was vital for constructing the profound, deep shadows, translucent glazes, and dramatic chiaroscuro modeling that defined the master workshops of the High Renaissance.
Empirical Markers of Historical Aging
Rather than displaying the uniform, chemically homogenized traits of a modern imitation, the physical behavior of the paint film under magnification records a genuine, multi-layered history:
Inter-Layer Delamination: The marked tendency of the historical strata to part cleanly during micro-scalpel extraction indicates that significant intervals of time passed between specific paint applications. This behavior points to a complex, non-continuous historical execution where individual layers had stabilized long before subsequent varnishes or interventions were introduced.
The Deep Fluorescent Resin Stratum: A distinct, strongly yellow-fluorescent resinous layer was isolated deep within three independent samples. Being locked safely beneath thick, subsequent varnish matrices and older paint strata, this phenomenon documents a localized structural history spanning multiple generations of ownership.
The Inscription Boundary Zone
Sample 4, extracted from a test blemish immediately adjacent to the lower-left inscription zone, records a clean, undisturbed layer progression: Resin Layer → Brown Paint Stratum → Carbonaceous Black Paint Stratum → Thick Varnish → Thin Dammar Varnish. The complete absence of modern spackle, synthetic filler compounds, or restoration putties (kittningar) directly beneath or adjacent to this zone demonstrates that the black carbon-based lettering resides on a structurally stable, integrated historical section of the primary canvas.
Technical Conclusion
While Nina Olivier’s 2023 optical microscopy served as an invaluable primary assessment of the painting’s structural landscape, its localized findings directly laid the groundwork for the more precise, advanced analytical tracking that followed. The presence of the authentic red-brown ground matrix and the complex, aged stratigraphy successfully provided the physical baseline that was later verified and chemically quantified through high-resolution micro-Raman spectroscopy at the Ångström Laboratory.
