... nm since the 1930s The obtained images provide interesting information on the working procedures and presence of retouching and overpainting, and enable the identification of underdrawing and ... ancient paintings, and in the obsidian hydration dating technique (vide infra) 28 Application of Instrumental Methods 1.4.7 Dating Methods Dating methods primarily applied in archaeological and archaeometric ... established: grinding, dissolving, derivatizing, melting and embedding Powdering, or grinding, of samples is a simple preparation method required in a number of spectrometric and spectroscopic...