Fresco and Mural Painting

Fresco and mural painting apply pigment directly to walls, with true (buon) fresco binding color into wet lime plaster as it cures into the surface itself.

Definition

Painting executed on walls or ceilings; in true fresco pigments suspended in water are applied to fresh, wet lime plaster and become bound into the surface as the lime carbonates, while secco painting is applied to dry plaster with an added binder.

Scope

This topic covers wall painting techniques, especially buon fresco — painting into fresh lime plaster so the pigments bind chemically as the plaster carbonates — and fresco secco, painted on dry plaster with a binder, along with the workshop logistics of giornate, cartoons, and sinopie, and the role of murals in monumental and public art.

Core questions

• How does buon fresco chemically bind pigment as lime plaster carbonates?
• How do giornate, cartoons, and sinopie organize the work of a large fresco?
• How does true fresco differ in durability and handling from fresco secco?
• What roles have murals played in religious, civic, and political programs?

Key concepts

• Buon fresco
• Fresco secco
• Giornate (daywork)
• Intonaco and arriccio plaster layers
• Sinopia and cartoon
• Lime carbonation

Key theories

Carbonation binding in buon fresco

The process by which calcium hydroxide in fresh plaster reacts with carbon dioxide to form calcium carbonate, locking water-borne pigments into the wall surface and giving true fresco its durability.

Daywork organization (giornate)

The workshop practice of plastering and painting only as much wall as can be completed while wet in a single day, visible as giornate joins that reveal how a fresco was planned and executed.

History

Wall painting is among the oldest pictorial arts, with major traditions in ancient Egypt, the Aegean, and Roman Pompeii. Italian buon fresco reached its height in the work of Giotto and the Renaissance masters, culminating in Michelangelo's Sistine Chapel ceiling. The technique was documented by Cennino Cennini and revived in the twentieth century by the Mexican muralists, notably Diego Rivera, for large-scale public art.

Debates

Cleaning and restoration of major frescoes

The conservation of works such as the Sistine Chapel ceiling has prompted debate over how far cleaning should go, since removing later secco additions and grime risks altering an artist's intended final surface.

Key figures

• Cennino Cennini
• Giotto
• Michelangelo
• Diego Rivera

Seminal works

• cennini1933
• mora1984
• mayer1991

Frequently asked questions

What is the difference between buon fresco and fresco secco?

Buon fresco is painted into wet lime plaster so the pigment binds into the wall as it cures, while fresco secco is painted onto already dry plaster with an added binder and is generally less durable.

Why did fresco painters work in sections called giornate?

True fresco must be painted while the plaster is still wet, so artists plastered and completed only the area they could finish in one day, leaving visible joins known as giornate.