KRAKÓW, POLAND—A team of researchers from Poland and the Netherlands has used a technique used to establish hair and eye color from modern forensic samples on remains up to 800 years old. “This system can be used to solve historical controversies where color photographs or other records are missing,” said Wojciech Branicki of Jagielonian University. The researchers have tested the system on the remains of inmates from a World War II prison camp and medieval bones from a Benedictine abbey near Kraków.