arriccio

the equivalent of the brown coat in a three coat plaster wall; the surface on which the sinopia is painted

bozzetto

the small scale full-color model (also modello) for the fresco composition; often in oil or watercolor

buon_fresco

“true” or “good” fresco; fresco means “fresh” in Italian, and a fresco is a painting into fresh plaster (finish coat of plaster laid on the wall that day)

cartoon

from the Italian cartone, or large sheet of paper, it is the full-size drawing used to transfer the design onto the intonaco

giornata

a day’s work—usually about 8 hours, but can be longer—determined by the length of time the plaster remains “fresh” and able to absorb the pigments when brushed on the wall; a large fresco is composed of many giornate, the seams between which often remain somewhat visible in the final painting

intonaco

the finish coat of plaster upon which the fresco is painted; composed of roughly one part lime putty and one part aggregate (usually salt-free river sand, but also pozzolana [volcanic ash], marble powder, etc.)

lime_milk

latte di calce in Italian; it is the limey milk that rises to the surface of a bucket of lime putty, but can also be made by mixing lime putty and water; can be used in fresco painting (it tends to lighten colors as it dries), also used to brush on the sinopia, and for lime wash wall painting

sinopia

derived from the name of a red pigment (sinoper) often used for this kind of painting, it is the outline of the final fresco painted on the arriccio coat; any pigment, in fact, can be used, and it is applied with lime milk to adhere to the “dry” arriccio; the sinopia principally provides guidelines for the various giornate