Across China: Multispectral imaging system tracks condition of millennia-old wooden slips

NAMPA / Xinhua

2026-10-07

LANZHOU, Oct. 7 (Xinhua) -- Under visual observation, virtually no writing is visible on Jiandu, bamboo or wooden slips that ancient Chinese people wrote on before the invention of paper, but in near-infrared images, the outlines of the ink marks faintly emerge. When switched to the ultraviolet band, subtle cracks and salt efflorescence on the surface of the slips, invisible to the naked eye, become clearly visible. This "magic" is performed b......

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