buon+fresco

Buon fresco is a fresco technique in which pigments are applied to plaster when it is still wet. The buon fresco technique consists of painting with pigment ground in water on a thin layer of wet, fresh, lime mortar or plaster. After a number of hours the plaster reacts with the air in a process called carbonation: This chemical reaction fixes the pigment particles at the plaster's surface in a protective crystalline meshknown as the lime crust. The advantage of buon fresco is its durability. In fresco secco, by contrast, the color does not become part of the wall and tends to flake off over time. The chief disadvantage of buon fresco is that it must be done quickly without mistakes.