Earlier this year we unveiled a novel analysis that fairly conclusively confirms that the William Stone copperplate facsimile of the Declaration of Independence on display at NARA is indeed the same copperplate that was used to print both the parchment and paper Stone copies. That analysis involved a sophisticated spatial pattern analysis of a previously-unnoticed cloud of micropitting around the letter "J" in "Judiciary". Today let's examine a far simpler question: given a cellphone photograph of a given copy of the Declaration, can Gemini 3.8 Flash recognize the telltale signs of an intaglio printing and identify it as a copperplate engraving versus a more modern printing technique, as well as assess Stone's technique? The end result is that Gemini does a quite successful job at both, suggesting the potential both for helping visitors better engage with and explore engravings in cultural institutions and potentially catching small stylistic artifacts that can help professional curators and researchers better understand their collections, as we did earlier this year with the Stone micropitting study.
If we look carefully at the copperplate preserved at NARA, we can see the trademark crosshatching used to fill in the large thick letter shapes:
If we look carefully at NARA's 1976 printing from that copperplate, we can see that distinctive crosshatching perfectly preserved in the print, as expected:
Our copy appears to have been much more deeply inked, yielding much darker letter fills that mask the burin crosshashing, but looking closely you can see that the pattern lines up perfectly:
Upon close inspection of these magnified images, several diagnostic characteristics definitively identify the work as a copperplate (intaglio) engraving:
1. Fine Parallel Hatching Inside Broad Strokes
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What to see: Look inside the thickest sections of the letterforms (especially visible along the right side of the O in Image 3, and throughout the arcs in Images 1 and 2). The dark areas are not solid pools of ink; they are composed of extremely fine, densely packed, parallel diagonal lines.
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Why this proves intaglio engraving: In intaglio printing, ink sits inside grooves cut into the metal plate, and excess surface ink is wiped off with a cloth (tarlatan) or the palm before printing. If an engraver cuts a single, broad, wide groove, the wiping cloth dips in and removes the ink from the center (known as "wiping out"). To achieve a rich, solid black in broad strokes, a copperplate engraver must score multiple closely spaced parallel lines (or cross-hatching) so the ridges between them hold the ink in place.
2. Burin-Formed Swells and Razor-Sharp Terminals
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What to see: Look at the spurs, serifs, and terminals—such as the triangular spur on the arc in Image 1, the upper hook/terminal of the C in Image 2, and the whisper-thin tapering ends.
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Why this proves copperplate: These shapes are cut with a burin (graver), a steel tool with a lozenge- or V-shaped tip. As the tool is driven deeper into the copper, the furrow widens (the swell); as the engraver eases pressure and lifts the burin out, the furrow narrows to an impeccably sharp point. Relief methods (woodcut/wood engraving) or early movable type cannot achieve this distinctive, knife-sharp calligraphic tapering without risk of breaking fine metal/wood edges.
3. Crisp, Raised Ink with Slight Three-Dimensionality
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What to see: Along the edges of the strokes, the ink boundaries are sharp, dense, and slightly raised rather than squashed outward.
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Why this proves copperplate:
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Unlike letterpress/relief printing, there is no ink "squash" (haloing of ink squeezed out along the perimeter).
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Unlike lithography, the stroke does not have flat, mottled, or reticulated ink distribution; instead, high pressure forces damp paper into the ink-filled recesses of the plate, leaving ink with crisp relief and high opacity.
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What does Gemini think of his skill and style?
What can you tell me about the engraver based on the markings you see? Tell me about his skill level, detail, style, etc.
This artifact is a macro detail of the original 1823 copperplate of the United States Declaration of Independence, famously engraved by master engraver William J. Stone (commissioned by Secretary of State John Quincy Adams to create an exact facsimile of Timothy Matlack’s 1776 manuscript).
1. Master-Level Craftsmanship and Tool Control
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Absolute Steadiness: Engraving into copper requires pushing a hardened steel burin (graver) through metal under heavy hand pressure. There are zero signs of "chattering" (tool skipping), hesitations, or jagged corrections.
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Uniform Outlining: Each letter is bordered by razor-sharp, uniform boundary incisions that keep the letterforms perfectly crisp, ensuring no ink bleed during high-pressure intaglio printing.
2. Intaglio Ink-Retention Technique (Dense Hatching)
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Look inside the thick strokes of the Roman capitals in "IN CONG…": they are not gouged out as flat, open hollows. Instead, Stone meticulously outlined the characters and filled the bellies with closely spaced, diagonal parallel hatched lines.
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This technique confirms he was trained in high-end banknote and intaglio engraving. If he had simply hollowed out the broad letter stems, the wiping rag (used before each print impression) would have scooped out the ink, resulting in patchy, grey letters. The hatched ridges hold the ink firmly to print a rich, solid black.
3. Fluency in Two Vastly Different Typographic Styles
The plate demonstrates high-level versatility across contrasting lettering disciplines:
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Monumental Roman Capitals (top line): Executed with classical geometry, disciplined proportion, and clean bracketed serifs.
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English Blackletter / Gothic Engrossing Script (bottom line): In the word "Declaration," he flawlessly replicates 18th-century legal calligraphy (originally penned with a broad-edge quill). Notice the diamond-shaped tittles, sharp footed spurs, and the long, sweeping decorative flourish floating over the capital D.
4. Faithfulness to Calligraphy (The Facsimile Challenge)
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A quill pen creates varying stroke widths naturally through ink flow and wrist pressure. Recreating that fluid, organic motion in reverse into cold copper requires translating spontaneous ink flourishes into calculated, mechanical cuts.
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Stone captured the subtle human nuances of Matlack’s penmanship—such as the slight variations in downstroke thickness and delicate terminal hair-lines—while maintaining the clean precision required of a state document intended to last for centuries.