MSU researchers turn secret police code into chemistry lab
Two MSU researchers took pages from a history book, unlocked East Germany's secret police code inscribed on them and turned the entire operation into an interactive chemistry lab all the while making history. The pair, Lyman Briggs School science historian Kristie Macrakis and assistant professor of chemistry Ryan Sweeder, spent the last two years analyzing archives uncovered from the Stasi, the former East German secret police during the Cold War. The Stasi used a technique of printing hidden text on carbon paper infused with the chemical cerium oxalate, which was only visible after being activated by a separate chemical agent, Macrakis said. Macrakis received the declassified Stasi documents while she was studying in Germany before and after the Berlin Wall fell in 1989. "It's not just your magic pen; it's a lot more sophisticated," she said.