Glue used by the Romans has stuck around for 2,000 years

German archaeologists claim to have found traces of a glue they say was made by the Romans more than 2,000 years ago and used to mount silver laurel leaves on legionnaires' battle helmets.

Researchers at the Rhineland historical museum in Bonn said they had found remnants of the glue on a legionnaire's iron helmet unearthed near the town of Xanten. It had lain on what was once the bed of the Rhine for at least 1,500 years.

Frank Willer, the museum's chief restorer, said researchers came across the glue by surprise while removing a tiny sample of metal from the helmet with a fine saw. The heat from the tool caused silver laurel leaves decorating the helmet to peel off leaving thread-like traces of the glue behind.