The gardening book owes its vivid green colour to a dye containing arsenic, officials say.
A rare book laced with a deadly poison has been discovered by librarians in Leeds.
Senior librarian Rhian Isaac discovered the book while cross-referencing the library's collection against a global database of known toxic texts.Image caption,The Poison Book Project - started by the International Institute for Conservation in America - aims to identify different editions of historic books produced using hazardous compounds and heavy metals such as arsenic.
"Amazingly, heavy metals were once quite commonly used in the production of books as a way to achieve what was considered a very aesthetically pleasing shade of green.
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