CLEAN : Notre-Dame de Paris: the Minister of Culture visits the restoration site (2)

The video discusses the first occurrence of humidity in a hospital, the presence of lead dust, and the importance of using bathrooms. It covers working conditions involving lead, the historical significance of lapidary marks as precursors to logos, and the impact of temperature on lead in the atmosphere. The video concludes with a clean facade and a summary of the findings.

What new insight or understanding did you gain from this video?