Solar radiation, rain, humidity and extreme temperatures. Cultural heritage is exposed to an array of external factors that deteriorate it over time. Among them, the most aggressive may well be microbial contamination, caused by an ample ecosystem of fungi, algae, bacteria and microscopic lichens that grow inside the pores of the materials the buildings are made of and they make these buildings less resistant to other external agents, speeding up the deterioration process over time.
Click here for original story, A more resistant material against microorganisms is created to restore cultural heritage
Source: Phys.org