Hair surface and mechanical properties of Copt mummies from Antinopolis

Abstract

In the late nineteenth century, excavations were conducted in the necropolis of the site of Antinopolis, a city founded in 130 CE. Over sixty Copt mummies, out of the thousands of graves excavated, were brought to France in the early twentieth century. Unlike mummies of the Pharaonic era, no specific study has been conducted on the mummies of the Christian era. To identify these techniques of mummification and their state of preservation, the Louvre museum has conducted a multidisciplinary study on thirty-nine mummies located throughout France.In this work, we studied the surface topography and the mechanical properties of the hair from eleven mummies.To qualify the hair wear, 3D topography of their surface has been measured with an interferometer of vertical resolution 2 nm and an analysed surface of 20 × 84 μm. The results show that, for most of the hair samples, the cuticle has completely disappeared and the cortex appears very porous. However, for a few of the hair samples, the scales are perfectly regular like those of healthy hair, which is probably due to the mummification techniques used.The mechanical properties of the hair were determined using a three-point bending mechanical test.The results show that the mechanical hair properties are not correlated with the surface morphology of the cuticle.