Colour degradation of façade coatings – the effect of nanopigments incorporation Nuno M. M. Ramos, Andrea R. Souza, Joana Maia and Ricardo M. S. F. Almeida E3S Web Conf., 172 (2020) 24004 Published online: 30 June 2020 DOI: 10.1051/e3sconf/202017224004