The mysterious doodles hidden in a 1,300-year-old book: Centuries-old books, manuscripts and printing plates often contain invisible etchings, mysterious letters – and even doodles. A new technology that maps the surface of these objects is bringing them to light.

The mysterious doodles hidden in a 1,300-year-old book: Centuries-old books, manuscripts and printing plates often contain invisible etchings, mysterious letters – and even doodles. A new technology that maps the surface of these objects is bringing them to light.

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