Most of our Italian Plasters can be used on exteriors as well as interior surfaces. They are a natural, mineral product made in Italy that allows your space to "breath", pulling moisture and pollutants outside. These materials are from the days of the Roman empire, yet are remarkably simplistic, organic and beyond functional to integrate in today's dwellings. A little background and facts on our Italian Plasters: Marmorino Roman Plaster A natural mineral product approved as an Eco construction material in Europe with optimum breathability 90%-95%, prohibits mold forming bacteria that creates mold, 0%-1.85% VOC. Marmorino has been in use since Roman times, and is in fact mentioned by the Roman author, Vitruvius, in his writings in 100 BC, "De Architectura". Other cultures, such as the Egyptians, Ancient Greeks, and the Etruscans, used tinted Marmorino to decorate the walls and is still existent on intact walls in these historical sites. It was used as a finish wall surface on Roman Lime Cement to provide transfer of moister to the outside, maintain breathability, and structural stability. Marmorino is an ideal plaster that can withstand centuries of moisture when applied to the external and internal wall surfaces. In the 1400s AD, during the Renaissance, there was a new effort to design and build based on Roman architecture. In this period re-began the use of smooth finished walls with mineral colors integrated in the lime plasters, to create the undulated colour effect commonly associated with Venetian Plaster. By the 1500s, Andrea Polladio had brought the use of Marmorino to it's maximum exposure collaborating with Alessandro Vittoria as a master plasterer to achieve the fame that Venetian Plaster endures until today. The inactive lime (slaked lime), as found in Antica Calce (Antique Lime Wash), Marmorino and Venetian Plaster acts as an anti-mold/fungus prohibitor. Being a porous material, but with an extremely hard surface, and used in conjunction with other pourus wall support materials, Marmorino and all Slaked Lime Products used in traditional Roman composition have incredible capacity to absorb moisture and wick that toward the external walls of the house. Absorbing oxegen and humidity, Marmorino is proven to absorb carbon monoxide and other toxins in your house and passively remove them toward the outside environment. It is for this reason that the EEC has mandated eventual building code requirements for any Eco Certifications to use these natural materials for the purpose of self cleaning and breathability. Surprisingly enough, with the right wall construction and use of these materials, Slaked Lime products have natural climate controlling aspects. You will have noticed this with any travels in Italy upon entering a restored Roman or Renaissance Villa.