Upon arrival at a crime scene, if investigators were to find nothing more than black ash, analyzing any of it would be impossible. “But fortunately, that’s never really the case,” Tague said. “If things are charred, then you can typically identify which artist would have generated the art.” 

It’s a delicate process. The eye can only see something as small as seventy-five microns, or about the width of a strand of hair. “You’re looking for particles much smaller than that,” Tague said. “So it’s tedious, really tedious. And you don’t want to disturb a crime scene. So it could take weeks or months just to recover the particles.” Even just two or three microns of dust could be the key to identifying the signature of Picasso.