1. National Institute of Research and Development for Chemistry and Petrochemistry- ICECHIM, Research Group „Evaluation and Conservation of Cultural Heritage” , 202 Splaiul Independentei , Bucharest , Romania
2. Valahia University of Targoviste , Materials Engineering Department , Targoviste .
3. Institute of Multidisciplinary Research for Science and Technology , Valahia University of Targoviste , 13 Sinaia Alley , Targoviste , Romania