1. Chemistry Department; Istituto Centrale Restauro e Conservazione Patrimonio Archivistico e Librario; Via Milano 76 Rome I-00184 Italy
2. Fakulteta za Kemijo in Kemijsko Tehnologijo; Univerza v Ljubljani; Aškerčeva c. 5 Ljubljana 1000 Slovenia
3. The Bartlett School of Graduate Studies; Centre for Sustainable Heritage, University College London; Gower Street London WC1E 6BT UK