Is It the Tree Paper or the Arsenic Paper?

In 20 16, researchers reported finding three rare books in the library collection of the university of southern denmark dating back to the sixteenth and seventeenth centuries. Researchers wanted to see if there were any crets buried in the text. So they studied the books with x x ra florescence. And they were surprised by what they found. Was it a, that the paper in the books was made from a tree that scientists thought had gone extinct in the 14 hundreds? Or was it b, that the exterior of these books was covered and poisonous arsenic?

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