Glossary of Italian gold-ground painting
Essential terminology for the study of panel painting iconography, technique & historical context.
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
A
Altarpiece — Eng.
A devotional work placed upon or behind an altar, typically a painted panel or series of panels. Gold-ground altarpieces dominated Italian churches from the late Duecento through the early Quattrocento, conveying the sacred presence of holy figures to the faithful.
Ancona — It.
A type of altarpiece, often with a cusped or pointed upper profile, associated with the Veneto and Adriatic regions. Anconae frequently feature the Virgin and Child enthroned under gilded Gothic architectural canopies.
Archivolt — Arch.
The ornamental moulding running around the outer curve of an arch in panel frames. In gold-ground polyptychs, archivolts are often punched or incised with foliate and geometric patterns that catch candlelight.
Assisting — Tech.
The technique of applying thin lines or hatching of gold leaf (or occasionally silver) over drapery to indicate divine light or celestial sheen, most notably in the draperies of Cimabue and early Duccio.
Aureole — Lat. aureola
A full-body nimbus or mandorla-shaped radiance surrounding the entire figure of Christ or the Virgin in scenes of the Transfiguration, Ascension, or Last Judgement, typically rendered in burnished gold leaf.
B
Baldachin — It. baldacchino
A canopy of honour depicted above enthroned figures in panel painting, often rendered in tooled gold to create a three-dimensional architectural illusion within a two-dimensional gilded space.
Battiloro — It.
A gold-beater, the craftsman who beat gold alloys into the ultra-thin sheets used as gold leaf. The quality of a battiloro's work directly determined the reflective quality of the fondo oro ground.
Biacca — It.
Lead white (basic lead carbonate), the primary white pigment used in Italian panel painting. Mixed with egg tempera, biacca was layered over black underdrawing to model flesh and highlights.
Bole — Fr. bol armoniac
A reddish-brown or ochre-coloured clay ground applied over gesso as the final preparatory layer before gold leaf is laid. The warm tone of Armenian bole ensures that any gaps in the gold appear as a warm, sympathetic hue rather than a stark white.
Burnishing — Tech.
The process of polishing laid gold leaf with a hard, smooth tool — traditionally a dog’s tooth, agate, or hematite — to produce a mirror-bright, reflective surface. Burnished gold creates the luminous, otherworldly background characteristic of the fondo oro tradition.
C
Cennino Cennini — Painter and author
Florentine painter (c. 1360–c. 1427) and author of Il Libro dell’Arte (c. 1400), the most important surviving technical manual of medieval Italian painting. Cennini’s detailed instructions on gesso preparation, gilding, tempera mixing, and gold tooling are an indispensable primary source for the fondo oro tradition.
Ciborium — Lat.
A container for the Eucharist host, but in art history also a canopied baldachin over an altar. The ornamental form influenced the canopy motifs tooled into gold grounds of altar panels.
Craquelure — Fr.
The network of fine cracks that develops over centuries in the gesso and paint layers of a panel painting. Distinctive crack patterns assist connoisseurs in dating and attributing gold-ground works and in distinguishing original surfaces from later restorations.
Cusping — Arch.
Decorative pointed projections forming trefoil, quatrefoil, or multilobed arches above individual figures in polyptych panels. Cusped frames are a hallmark of the Gothic style that transformed Florentine and Sienese altarpieces from the 1280s onward.
D
Desco da Parto — It.
A decorated tray presented to a mother after childbirth, often painted with secular or sacred subjects on a gold ground. Examples by masters such as Bartolomeo di Fruosino illustrate the extension of gold-ground technique into domestic devotional objects.
Deësis — Gk. déēsis
An iconographic composition in which the Virgin Mary and St John the Baptist flank Christ in intercessory prayer, originating in Byzantine art and appearing frequently in the upper registers of Florentine and Sienese polyptychs.
Diaper Pattern — Arch.
A repeating geometric or foliate motif, incised or punched into the gold ground to create a textured field behind figures. Diapers activated the gold surface, preventing the flat reflection from dominating the painted image.
Diptych — Gk. diptychos
A devotional work consisting of two hinged panels. Portable diptychs — often small, with ivory or wood wings — were a common private devotional format in fourteenth-century Italy, produced by painters from Tuscany to the Veneto.
E
Egg Tempera — Tech.
The primary binding medium of Italian panel painting before the adoption of oil. Pigments were ground and mixed with egg yolk (and occasionally egg white or the whole egg) to produce a fast-drying, luminous, and highly stable paint film compatible with gold-ground grounds.
Encaustic — Gk. enkaiō
An ancient painting technique using pigments bound in hot wax, practised in Byzantine icon production and occasionally studied by medieval artists seeking to emulate Greco-Roman models. By the Duecento it had been largely supplanted by egg tempera in Italy.
F
Flabellum — Lat.
A liturgical fan used during the Mass to protect the Eucharist. Representations of angels holding flabella appear in late Duecento and Trecento Florentine panels as markers of celestial liturgy.
Fondo Oro — It.
Literally ‘golden ground’: the burnished gold-leaf background that defines the tradition of Italian panel painting c. 1250–1430. The gold ground functions not as a naturalistic sky but as a sacred space — the uncreated light of the divine realm.
Fresco — It.
Mural painting on freshly applied wet plaster (buon fresco) or dry plaster (secco). Although distinct from panel painting, fresco iconography — especially in Giotto’s Arena Chapel cycle — profoundly influenced the spatial ambitions of Trecento gold-ground masters.
G
Gesso — It.
A mixture of calcium sulphate (gypsum) or chalk bound in animal-skin glue, applied in multiple coats to a wooden panel to create a brilliant white, smooth ground for painting and gilding. Gesso grosso (coarse) and gesso sottile (fine) were applied in succession.
Glue Size — Tech.
A dilute solution of animal-hide glue applied to the wood panel before the gesso layers, sealing the grain and providing a key for subsequent coats. Without correct sizing, gesso would absorb unevenly and gold leaf would not adhere.
Gold Leaf — Tech.
Extremely thin sheets of beaten gold, typically 22–24 carat, applied to the bole-covered gesso with dilute glue size or glair (beaten egg white). Standard sheets in Cennini’s time measured approximately 3½ × 3½ inches.
Gothic — Arch.
The Northern European architectural and decorative style, adopted in Italian panel painting from c. 1270–80, characterised by pointed arches, ogival forms, cusping, and elaborate carved frames. The Gothic style shaped the formal language of Florentine and Sienese gold-ground altarpieces throughout the Trecento.
H
Halo (Nimbus) — Lat.
The circular disc of gold leaf surrounding the head of a holy figure, signifying divine or saintly status. Haloes were tooled, punched, or incised with decorative patterns, and their elaborate treatment was a primary vehicle for the goldsmith’s art within panel painting.
Hieratic Scale — Art H.
The convention of representing sacred figures at a size proportional to their spiritual importance rather than their physical distance from the viewer. Christ, the Virgin, and major saints appear significantly larger than secondary figures in Italian gold-ground panels.
I
Imprimatura — It.
A thin, transparent toning layer applied over the gesso ground before painting, used to unify the surface and reduce the stark whiteness of the preparation. In tempera technique, an imprimatura of terre verte was standard for flesh underpaint.
Incising — Tech.
The technique of scratching or engraving linear designs into the bole and gold leaf surface with a stylus or burin. Incised patterns activated the gold ground with light-catching lines and created architectural details, fabric patterns, and decorative borders.
International Gothic — Style
A courtly, elegantly decorative style that flourished across Europe c. 1380–1430, characterised by sinuous line, jewel-like colour, naturalistic detail, and elaborate gilded ornament. In Italy it is associated with Gentile da Fabriano, Pisanello, and Michelino da Besozzo.
J
K
Kolophonium (Rosin) — Tech.
Pine resin occasionally used in varnishes applied over finished gold-ground panels to protect the paint surface and saturate colours. Its yellowing over centuries complicates the reading of original tonalities in conservation.
L
M
Maestà — It. majesty
A composition showing the Virgin enthroned in majesty (maestà) surrounded by angels and saints, the dominant devotional image of Florentine and Sienese altarpieces. Duccio’s Maestà for Siena Cathedral and Cimabue’s for Santa Trinità, Florence, are its canonical expressions.
Mandorla — It. almond
An almond-shaped aureole enclosing the full figure of Christ or the Virgin in scenes of the Transfiguration, Ascension, or Last Judgement. Usually rendered in concentric rings of burnished gold shading to lighter, more silvery tones toward the figure.
Mastic (Mastice) — Material
A natural resin from the mastic tree (Pistacia lentiscus) used in varnishes and as a medium modifier. Its inclusion in gold-ground panel varnishes was noted by Cennini as a way to produce a glossy, protective finish.
Mordant Gilding — Tech.
A technique in which gold leaf is applied over a sticky adhesive (mordant) rather than over bole and water gilding, used for intricate applied ornament on frames, textiles, and architectural details where the matt, non-burnishable finish is acceptable or desired.
N
Niello — It./Lat.
A black sulphide of silver, copper, or lead inlaid into engraved metal to create decorative patterns. The fine linear ornament of niello work influenced the incised decoration of gold grounds and gilded frames in Tuscan panel painting.
O
P
Pala d'Altare — It.
The Italian term for a large altarpiece, particularly an integrated single-surface panel (as opposed to a polyptych with divided sections). The unified pala emerged in the mid-Trecento and became standard by c. 1400, partly under the influence of monastic Dominican altarpieces.
Panel — Tech.
The wooden support of Italian gold-ground paintings, typically fashioned from seasoned poplar (pioppo) in central Italy or willow, lime, or oak in the north. Panels were constructed with horizontal grain and reinforced with crossbars to resist warping.
Pastiglia — It.
Raised ornament formed from a paste of gesso mixed with glue, applied in relief to panel surfaces and frames before gilding. Pastiglia creates three-dimensional haloes, textile patterns, and architectural mouldings that catch light dramatically over gold grounds.
Polyptych — Gk.
An altarpiece consisting of three or more hinged or framed panels, the standard format of major Florentine and Sienese altarpieces c. 1270–1400. The central panel typically depicts the Virgin and Child, flanked by saints on the wings.
Predella — It.
The horizontal narrative strip of small panels forming the lower register of a polyptych altarpiece. Predellas allowed painters to explore sequential narrative within the gold-ground format, often depicting scenes from the lives of the saints shown above.
Punch Work — Tech.
Decorative patterns made in the gold leaf ground by striking small steel punches of varying designs (rosettes, stars, dots, foliate forms) with a hammer. Each workshop maintained distinctive punch sets, allowing modern scholars to attribute unsigned works to specific hands.
Q
Quatrefoil — Fr.
A decorative form consisting of four equal lobes, used in the cusping of altarpiece frames and as a repeated motif in incised or punched gold grounds. The quatrefoil is one of the defining ornamental forms of Gothic Italianate painting.
R
Retable — Fr./Lat.
An altarpiece placed directly on or behind the altar table, the most common position for Italian gold-ground panels. The term is often used interchangeably with altarpiece in art historical literature.
Rogier van der Weyden — Master painter
Flemish master (c. 1399–1464) whose influence on Italian painters from the mid-Quattrocento onward helped accelerate the decline of the gold ground in favour of oil-based landscape backgrounds — though Rogier himself used gold grounds in certain works.
S
Santa Conversazione — It.
A compositional type depicting the Virgin and Child with saints informally grouped in a shared space, which gradually replaced the rigidly divided polyptych format from c. 1420 onward. The type represents a late, transitional stage of the gold-ground tradition.
Sgraffito — It.
In tempera painting, the technique of scratching through an upper paint layer to reveal the gold or lighter layer beneath, creating patterns of shining lines in draperies, architectural ornament, and haloes. Distinguished from incising, which scores the ground before painting.
Sinopia — It./Gk.
A red-ochre underdrawing, named after the ancient port of Sinope on the Black Sea from which the pigment was traded. In panel painting, an equivalent preliminary drawing in red or black defined figures before the application of paint.
Size — Tech.
A thin solution of rabbit- or calf-skin glue, applied warm to the panel before gessoing to seal the wood grain and prevent the gesso from cracking. See also: Glue Size.
Stilted Arch — Arch.
An arch whose spring-point is raised above the impost, producing a taller, narrower profile than a regular semicircular arch. Stilted arches appear frequently in the Gothic frame elements of Florentine and Sienese polyptychs.
T
Tempera — Lat. temperare
The principal painting medium of the fondo oro tradition, in which dry pigments are bound in a water-miscible emulsion. Tempera dries rapidly by evaporation and is incompatible with oil, requiring deliberate layering of transparent glazes and opaque lights. See also: Egg Tempera.
Terre Verte — Fr.
Green earth pigment (celadonite or glauconite), widely used as an underpaint for flesh in Italian tempera painting. Its cool greenish tone created a chromatic balance with the warm bole of the gold ground and provided the shadows of modelled faces.
Throne (Trono) — Iconog.
The architectural seat upon which the Virgin or Christ is depicted in Maestà compositions. The throne evolved from a flat Byzantine bench toward an elaborate Gothic throne with inlaid marble and cushioned steps, reflecting both theological status and contemporary courtly furniture.
Trecento — It.
The fourteenth century (literally ‘three hundreds’). The Trecento is the central century of the Italian gold-ground tradition, encompassing the work of Duccio, Giotto, the Lorenzetti, Simone Martini, Orcagna, and their followers.
Triptych — Gk. triptychos
A devotional or altarpiece work in three panels, hinged or fixed. The triptych format was enormously popular in fourteenth-century Italy and was produced at every scale, from portable private devotional objects to large church altarpieces.
Typos — Gk.
In Byzantine and early Italian theological discourse, a prefiguring image or type from the Old Testament that anticipates a New Testament antitype. The typological programme underpinning many gold-ground altarpieces reflected the exegetical theology of Dominican and Franciscan patrons.
U
Uffizi Gallery — Museum
The Galleria degli Uffizi in Florence holds the world’s greatest collection of Italian gold-ground panel paintings, including works by Cimabue, Duccio, Giotto, Simone Martini, and Gentile da Fabriano. Its rooms dedicated to the Duecento and Trecento constitute an essential reference for the field.
Ultramarine — Pigment
The most prized blue pigment of the medieval and Renaissance periods, produced from ground lapis lazuli imported from Badakhshan (modern Afghanistan). Its intense blue was reserved for the Virgin’s mantle in gold-ground panels as a signifier of her supreme status.
Underdrawing — Tech.
Preliminary compositional lines drawn on the gesso surface (in ink, charcoal, or metalpoint) before painting. Infrared reflectography has revealed underdrawings beneath gold-ground panels that show pentimenti and compositional revisions invisible to the naked eye.
V
Verdigris — Pigment
A copper-based green pigment (copper acetate), frequently used in fourteenth-century Italian panel painting for foliage, drapery, and backgrounds. Notoriously unstable, verdigris darkens or turns brown over time, distorting the original chromatic balance of many gold-ground panels.
Vermillion — Pigment
Bright red mercuric sulphide (cinnabar), one of the most vivid pigments available to medieval painters. Used for rich red draperies, architectural details, and inscriptions, vermillion provided strong chromatic contrast against the gold ground.
W
Water Gilding — Tech.
The standard gilding technique for fondo oro panels, in which gold leaf is picked up on a damp brush and laid onto a moist bole surface, then burnished when dry. Water gilding produces the brightest, most mirror-like surface of all gilding techniques.
Wilton Diptych — Object
An exceptionally refined portable diptych (c. 1395–99, National Gallery, London) with an English royal commission and gold ground, demonstrating the International Gothic synthesis of English, French, Italian, and Bohemian influences in gold-ground panel painting.
X
Xylography — Tech.
Wood-block printing, occasionally used to transfer repeating decorative patterns to frames and painted surfaces in the late Trecento. Stamped patterns extended the tooled decorative vocabulary of the gold-ground painter to printed paper and textile designs.
Z
Zecca — It.
A mint; the institution responsible for guaranteeing the purity of gold used in commercial transactions, including the gold alloys supplied to battilori for beating into leaf. The Florentine florin (fiorino d’oro), introduced in 1252, was the monetary standard against which the purity of painters’ gold leaf was measured.