How three poisonous books were discovered in a university library

Research led to the discovery that three historic books were covered in a layer of arsenic source: http://www.independent.co.uk/life-style/history/poisonous-books-arsenic-history-science-denmark-a8426431.html #Headlines by: Jakob Povl Holck, Kaare Lund Rasmussen

Original Post: https://www.independent.co.uk/life-style/history/poisonous-books-arsenic-history-science-denmark-a8426431.html