The Department of Chemistry, The Spectral Analysis Team at the Polish Academy of Sciences, The University of Warsaw Biological and Chemical Research Centre (CNBCh UW), and E-RIHS.pl extend an invitation to the XXI Conference on chemical analysis and conservation (Analiza Chemiczna w Ochronie Zabytków). The conference will take place online, on 2-3 December 2021. The conference programme, the list of abstracts, and registration details are available via E-RIHS.pl.