ANA MIHAELA SAVIUC-PAVAL1 , ION SANDU2*, IONEL MARCEL POPA3, IRINA CRINA ANCA SANDU4, VIORICA VASILACHE2,5, IOAN GABRIEL SANDU6 1) „Sf. Ap. Andrei” School of Arts and Crafts, 34 Victoriei, Blvd., 751200, Dorohoi, Romania 2 “Al. I. Cuza” University of Iasi, Arheoinvest Platform, Laboratory for Scientific Investigation, 11 Carol I Blvd.,700506, Iasi, Romania 3 ,,Gh. Asachi” Technical University of Iasi, Faculty of Industrial Chemistry and Environmental Science, 71 D-trie Mangeron Blvd., Iasi, Romania 4 Requimte e Núcleo do Departamento de Conservação e Restauro, Faculdade de Ciencias e Tecnologia, Universidade Nova de Lisboa, Campus da Caparica, 2829-516 Caparica, Portugal 5 Romanian Inventors Forum, 3 Sf. Petru Movila Str. Bl. L11, Sc. III, Et. 3, Ap.3, 700089, Iasi, Romania 6 ,,Gh. Asachi” Technical University of Iasi, Department of Teacher Training, 71 D-trie Mangeron Blvd., Iasi, Romania