Friday, January 8, 2016

Fresco


FRESCO IS A METHOD OF WALL PAINTING. In buon fresco (true fresco), pigments are mixed with water and applied to an intonaco (layer of fresh, damp lime-plaster). The intonaco absorbs and binds the pigments as it dries making the picture a permanent part of the wall surface. The intonaco is applied in sections called giornate (daily sections). The size of each giornata depends on the artist’s estimate of how much can be painted before the plaster sets. The junctions between giornate are sometimes visible on a finished fresco. The range of colors used in buon fresco are limited to lime-resistant pigments such as earth colors (below). Slaked lime (burnt lime mixed with water), bianco di San Giovanni (slaked lime that has been partly exposed to air), and chalk can be used to produce fresco whites. In fresco secco (dry fresco), pigments are mixed with a binding medium and applied to dry plaster. The pigments are not completely absorbed into the plaster and may flake off over time.

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