Tollund Man
Bog bodies dry up and decompose rapidly, when they are taken out of the bog. Because of the facial expression, and the general state of the head, the decision was taken to expose the body. At the time, the head was preserved using Polyethylene glycol, the only material available. This method did not permit to preserve the body; it dried up and decayed. Today, the head is attached to a copy of the body. Both feet and the right thumb were also in a good state of preservation when the body was found in the 1950s. For this reason, they were kept in formaldehyde for analysis later.  In 1976, the Danish Police Force made a finger-print analysis, making Tollund Man's thumb print one of the oldest finger-prints on record. Tollund Man is exposed in the Silkeborg Museum.