Iterference test of green biocides on mural painting from hypogean monument

Due to the specific microclimatic conditions, mural paintings placed in hypogean monuments occur to biological attack. The application of natural biocides, safe and eco-friendly, is the bet- ter solution to prevent biodeterioration phenomena in this context. Lately, many new green biocides have been developed but applied in the conservative intervention only to a minor ex- tent; because of the fewer data about the interaction of the new products with the substrate. This study aimed to investigate the interference test of four green biocides on mural painting in Etruscan tombs (Necropolis of Monterozzi, Tarquinia). Mock-ups of Etruscan mural painting were reproduced and tested in similar hypogean microclimatic conditions. Colorimeter, contact sponge method and portable optical microscope were applied.