From Italian fresco, affresco intonaco, ‘on the fresh plaster’. Wall and ceiling paintings, in which the pigments are applied to a damp base either in pure form or with the aid of a special binder such as diluted glue, casein, or marble powder. The composition of the covering varies; usually, it is a whitewash mortar mixed with different additives which are applied one after the other in several layers. Basically, the fresco technique lies in the fact that during the drying process of the plaste…