Fig 5. Well-developed polishes originated from contact with different materials and unused surfaces.

a) LSM-maximum intensity image of an unused surface. Note the smoothness of the bigger quartz crystals; b) The two selected areas where LSCM measurements were performed on the same unused area; c) SEM image of a polished area after contact with cane; d) SEM image of a polished area after contact with antler; e) SEM image of a polished area after contact with bone; f) SEM image of a polished area after contact with wood.