Green

 

"...locks labeled 'Bonaparte's hair' (which his doctor incidentally reported at the time of his death as 'thin, fine and silky') commanded quite a price on the open market... After being bought at an auction in 1960 it was chemically analyzed... what they found instead was a clue to the fall of greatness. They found arsenic, and in substantial quantities."

Pages 262-263

I wanted to explore the idea of the arsenic being held within a person's hair, almost like a tag telling the scientists what may have caused his demise.