FRANCE. Paris, 11 march 2020 Notre-Dame of Paris reconstruction process still under securisation. Selection of stones and steel, iron pieces removed from the cathedral after the fire. Some are burnt, damaged or re-usable. All are contamined by lead. Lise Leroux, research ingeneer specialised on stones and Aurélia Azema specialised on metal and lead both from LRMH (Laboratory of Research of Historical Monuments). (In red) MaximeL'Héritier, "Maitre de Conférence" at Paris VIII university specialised on metal and lead working here for the CNRS. (In white)