Infrared image detail of Scholar Sharpening a Quill showing line underdrawings of the book and hourglass, together with a broader-brushed sketch at the top rim of the book. InGaAs camera using 1500-1680nm filter (image: Shawn Digney-Peer)
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Infrared image detail of Scholar Sharpening a Quill showing line underdrawings of the book and hourglass, together with a broader-brushed sketch at the top rim of the book. InGaAs camera using 1500-1680nm filter (image: Shawn Digney-Peer)