1. National Conservation CentreCentral Chemical Laboratory Evlija Čelebija b.b. 1000 Skopje Republic of Macedonia
2. Institute of Chemistry, Faculty of Natural Sciences & MathematicsUniversity ‘Ss Cyril & Methodius’ Arhimedova 5 1000 Skopje Republic of Macedonia
3. Laboratory of Chemical Science for Safeguarding the Cultural Heritage, Department of Chemistry and Industrial ChemistryUniversity of Pisa Via Risorgimento 35 56126 Pisa Italy