It is a very ancient technique used since the beginning of human history, when the mankind used to paint on humid walls in the grottoes, using natural colouring materials.
It is made covering the support with a layer of putty lime and sand: this mixture is added to a second layer called arriccio and to a third layer of thin plastering which is painted by quick strokes of the brush, while it is still humid. In the drying stage, the surface absorbs the carbon dioxide and becomes solid making the colours (natural pigments diluted with pure water only) crystalline and insoluble. The fresco peculiarity is its unique transparency, furthermore we can consider the fresco a living technique, because there is only one magic moment to paint on fresh mortar and the chemical process, which takes place after that moment transforms mortar, pigment and water into one indivisible piece.

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