**Author details**

Rodica-Mariana Ion1,2\*, Ramona-Marina Grigorescu<sup>1</sup> , Lorena Iancu1,2, Paul Ghioca1 and Nicoleta Radu<sup>1</sup>

\*Address all correspondence to: rodica\_ion2000@yahoo.co.uk

1 ICECHIM, Research Group "Evaluation and Conservation of Cultural Heritage", Bucharest, Romania

2 Doctoral School of Materials Engineering, Valahia University, Targoviste, Romania
