Piers’ research based work on the WWII occupation of Alderney has been conducted with the help of forensics specialists in the U.K. and U.S. including ballistics experts from John Jay College of Criminal Justice in New York City, who are amongst the most internationally respected in their field. The prints are silkscreened with ink made from burned cordite, removed from ammunition abandoned by the Germans on Alderney, after the war ended.