WhatsApp usOur comprehensive fine art glossary brings together the full spectrum of traditional and contemporary artistic techniques. Designed as both a practical reference for conservators, artists, collectors, and an educational resource for anyone interested in the technical history of sculpture, this edition traces the evolution of sculptural practice, from stone and bronze to porcelain.
This series also covers:
By understanding how sculpture materials are selected, formed, and finished, we gain clearer insight into an artist’s intentions, the behaviour of surfaces and structures over time and the considerations that guide conservation, preservation, handling and display.
Above: detail from an alabaster relief by Leonhard Kern, 1640-50
Decorative Object Materials & Techniques
Earthenware
Earthenware is a low-fired, porous ceramic made from clay fired at relatively low temperatures (typically 900 to 1100°C). Because it remains absorbent, it is often coated with a glaze to provide colour, durability and waterproofing. Its versatility and ease of production make it suitable for vessels, tiles, sculptures and decorative wares.
Used by nearly all ancient cultures, earthenware can be found across Egyptian and Greek pottery through to medieval European and Islamic ceramics.
Stucco
Stucco is a fine plaster made from lime, gypsum or a combination of aggregates, used to coat walls, form decorative mouldings or create low-relief sculpture. Applied wet and worked with tools, it can be smoothed, carved or modelled into intricate architectural ornaments, from simple coatings to elaborate Baroque reliefs.
Used since antiquity, stucco became especially prominent in Renaissance and Baroque interiors, where artists such as Giovanni Battista Tiepolo and the Wessobrunner school produced richly sculpted decorations.
Bronze
Bronze is a strong metal alloy widely used for casting sculpture through methods such as lost-wax casting. Its durability, ability to capture fine detail and capacity to develop rich surface patinas have made it a preferred material for everything from small figurative works to monumental public statues.
Used the sculpture of ancient Greece and Rome, bronze was revived in the Renaissance by artists like Donatello and later mastered by Cellini, Rodin, Henry Moore and Barbara Hepworth.
While robust, bronze is vulnerable to corrosion especially in humid or polluted environments where it can develop green or powdery deterioration known as bronze disease. Proper care includes stable humidity, gentle handling and avoiding abrasive or aqueous cleaning methods to protect its surface and patina.
Above: detail from an ancient Greek bronze mirror, 4th century BC
Alabaster
Alabaster is a soft, fine-grained, semi-translucent stone that is used for carving decorative objects, sculptures and architectural details. Alabaster has a smooth texture and gentle translucency, allowing for crisp carving and a distinctive, glowing surface.
Historically used in ancient Egypt and Mesopotamia, alabaster later became prominent in the Nottingham workshops of medieval England. Calcite alabaster forms most ancient artefacts, a softer gypsum alabaster was used in the European workshops.
Proper care for alabaster requires dry, stable conditions, minimal handling and expert cleaning methods, as it can easily scratch, dissolve in water and develop surface deterioration.
Inlay
Inlay is a decorative technique in which contrasting materials such as wood, metal, stone, shell, ivory or glass are set into in a surface to create patterns, images or intricate details. The effect relies on precise cutting and close fitting, producing striking contrasts of colour, texture and reflectivity.
Conservation of inlay requires careful environmental control, minimal handling and protection from fluctuations that may cause the contrasting components to expand or contract at different rates.
Faience / Maiolica
Faience (in northern Europe) and maiolica (in Italy) are tin-glazed earthenware distinguished by their bright, opaque white surface and glossy finish. This tin glaze provides a smooth ground for colourful painted decoration, making the ware vibrant and highly decorative.
Historically, these ceramics flourished in Renaissance Italy, especially in centres such as Deruta, Faenza and Urbino. Tin-glazed earthenware was also used to produce Delftware.
Above: detail from a maiolica dish, 1520
Eglomise / Verre Églomisé
Églomisé is a decorative technique in which designs are painted, gilded or engraved on the reverse side of glass. Gold or silver leaf is often applied behind the glass and then selectively removed or painted over to create intricate, reflective images, borders or lettering. When viewed from the front, the glass protects the decoration and gives it exceptional brilliance.
Revived in 18th century France, the technique is named after decorator Jean-Baptiste Glomy, who popularised it in framing and small objects. Églomisé has since been used in furniture, mirrors, signage and decorative panels.
Bole
Bole is a finely ground red or brown clay mixed with glue and applied as an underlayer beneath gold leaf in traditional water gilding. Its smooth, slightly cushioned surface allows gold leaf to adhere evenly and be burnished to a high, reflective shine. The warm colour of bole also enhances the richness and depth of the gold.
Terracotta
Terracotta is a fired clay ceramic, typically reddish-brown due to its iron content. It is used for sculpture, architectural ornament, tiles and household objects. Terracotta is shaped while soft, then low-fired to create a porous but durable material that can be left unglazed or finished with slips, paints or glazes.
Historically used across ancient Greece, Rome, China and Mesoamerica, terracotta ranges from Greek Tanagra figurines to the monumental Chinese Terracotta Army. In the Renaissance, artists such as Luca della Robbia and Donatello used it for expressive modelling and glazed reliefs.
Above: detail from a terracotta sculpture by Albert-Ernest Carrier-Belleuse, 1868-70
Patina
Patina refers to the thin surface film or coloration that develops on metal, stone, wood or other materials through natural ageing or chemical treatment.
On bronze, it often appears as green, brown or black oxidation. On stone, it may take the form of surface darkening or weathering. Patinas can be created intentionally to enhance colour and texture, or they may form gradually through exposure to air, moisture and handling.
Patina can be a crucial indicator of age and authenticity. Conservation aims to preserve stable patina while preventing active deterioration, requiring controlled humidity, careful cleaning and avoidance of abrasive or overly aggressive treatments.
Fibreglass
Fibreglass is a composite material made by reinforcing resin, typically polyester or epoxy, with fine glass fibres. Lightweight yet strong, it can be moulded into complex shapes and finished with paints, gels or pigments, making it popular for modern sculpture, furniture and architectural elements.
Widely adopted from the mid 20th century, fibreglass became a key material in contemporary art and design, used by artists such as Eva Hesse and by commercial designers in mid-century furniture.
Lacquer
True lacquer is a glossy, durable coating traditionally made from the sap of the lacquer tree in East Asia. There are also resin and shellac varieties. Applied in multiple thin layers and polished to a high sheen, it creates a hard, protective surface on wood, metal and other materials, often enhanced with pigments, gold powder or inlay.
Lacquerware is historically part of Chinese, Japanese and Korean craftsmanship, lacquer has been used for furniture, boxes, screens and ceremonial objects. Maki-e and carved red lacquer are two prominent varieties in the antiques market.
Above: detail from a Japanese lacquer box, Meiji periodÂ
Gilding
Gilding is the technique of applying thin sheets of gold, known as gold leaf, to a prepared surface such as wood, metal or plaster. The surface is typically coated with gesso and bole before the leaf is laid and burnished, producing a luminous, reflective finish used for frames, sculpture, manuscripts and decorative objects.
Practised since ancient Egypt and widely used in medieval and Renaissance Europe, gilding adorned altarpieces, icons and illuminated manuscripts, with workshops such as those of Florence and Nuremberg perfecting highly refined techniques.
Although gold itself is stable, gilded surfaces are delicate and easily abraded; the underlying gesso and bole can crack, lift or flake. Conservation of gilt frames, furniture or sculptural objects requires protective display conditions and avoiding moisture or abrasion to preserve the fragile leaf and its ground layers.
Silverwork
Silverwork refers to decorative or sculptural objects made from silver, often enhanced with techniques such as chasing, repoussé, engraving or gilding.
Mother of Pearl
Mother of pearl (also called nacre) is the iridescent inner layer of certain mollusc shells, valued for its shimmering surface and used extensively in inlay, jewellery, buttons and decorative objects. It’s natural lustre and ability to catch light make it a striking contrast material when set into wood, metal or lacquer. Although visually durable, mother of pearl is sensitive to dryness and heat, which can cause cracking, warping or loss of vibrancy.
Used in Eastern, Egyptian and Islamic art, mother of pearl was especially prominent in Ottoman, Indian (Mughal) and Chinese decorative traditions. Later, it can be found in Victorian furniture and accessories.
Above: detail from a mother of pearl and lacquer tray
Raku
Raku is a Japanese low-fired ceramic technique in which pieces are removed from the kiln while still hot, producing crackled glazes, smoky surface patterns and irregular, organic textures. Traditionally hand-shaped rather than wheel-thrown, raku ware emphasises spontaneity, simplicity and the unpredictability of firing. Originating in 16th century Kyoto, raku ceramics are closely associated with the tea ceremony.
Sgraffito
Sgraffito is a decorative technique in which a top layer of paint, slip or plaster is scratched through to reveal a contrasting colour beneath. Using tools such as styluses or blades, artists create patterns, images or textures by cutting back the upper layer, producing sharp, graphic contrasts and intricate surface designs.
Historically used in European architecture, façades and ceramics, the sgraffito technique also appears in mural decoration and pottery across many cultures.
Porcelain
Porcelain is a hard, white, high-fired ceramic made primarily from kaolin clay, valued for its strength, fine grain and characteristic translucency. Two main types exist: hard-paste porcelain, the original Chinese formula fired at extremely high temperatures (1200 to 1400°C) and soft-paste porcelain, a European attempt to imitate it using mixtures of clay, frit and glassy ingredients fired at lower temperatures. Hard-paste is generally stronger and more durable, while soft-paste often has a warmer tone and slightly softer surface.
Perfected in China during the Song and Ming dynasties, porcelain became highly sought after in Europe, leading to the development of soft-paste wares at Medici Florence, Saint-Cloud and Chelsea, and later the development of true hard-paste at Meissen.
Above: detail from a dish by Chelsea Porcelain Manufactory, 1753-54
Limestone
Limestone is a relatively soft, workable sedimentary stone composed mainly of calcium carbonate. Its fine, even texture makes it suitable for detailed carving, architectural ornament and sculpture, and its natural colour ranges from pale cream to warm grey tones.
Used since antiquity in Egyptian, Greek and Roman sculpture and architecture, including the Great Pyramid structures and many medieval European cathedrals, limestone has long been valued for its accessibility and ease of shaping.
Veneer
Veneer is a thin decorative layer of fine wood applied over a cheaper or more stable base material, such as softwood or board. Veneering allows makers to use rare, beautifully figured timbers efficiently while achieving smooth, elegant surfaces in furniture, cabinets and decorative objects.
Marble
Marble is a dense, crystalline limestone prized for its fine grain, smooth polish and ability to hold precise detail, making it a preferred material for sculpture and architectural ornament. Its subtle translucency, especially in white varieties like Carrara marble, adds a lifelike quality to carved forms. Central to Greek and Roman sculpture, marble was later revived by Renaissance masters such as Michelangelo.
Although durable, marble is vulnerable to acid erosion, staining, surface sugaring and abrasions. Conservation requires avoiding acidic cleaners, limiting outdoor exposure to pollutants and ensuring stable conditions to protect its smooth, finely carved surfaces.
Casting
Casting is a process in which a liquid material such as bronze, plaster, wax, resin or glass, is poured into a mould and allowed to harden, producing a shaped object that replicates the mould’s interior form. It enables precise reproduction, multiple editions and the creation of complex shapes that would be difficult to carve or model directly.
Used since antiquity for metalwork and sculpture, casting includes techniques such as lost-wax casting for bronze and slip casting for ceramics. Artists from ancient Greek bronze-workers to Benvenuto Cellini, Auguste Rodin and many modern sculptors have relied on casting for its versatility.
Chasing
Chasing is a metalworking technique used to refine, sharpen or add detail to a metal surface after casting. Using small chisels, punches and hammers, the artist works the surface to define contours, deepen lines, create textures or correct imperfections without removing significant material.
Vitreous Enamel
Vitreous enamel is a decorative coating made by fusing finely ground coloured glass to a metal surface, typically copper, silver or gold, through high heat in a kiln. Once fired, the enamel forms a smooth, durable, glossy layer. Techniques such as cloisonné, champlevé and plique-à -jour use cells, recesses or open frameworks to hold and shape the coloured enamels.
This material has been used since antiquity, especially in Byzantine, Islamic, Chinese and Japanese decorative arts. Vitreous enamel is also found in 19th century European jewellery and ‘objets de vertu’ by makers such as Fabergé.
Although extremely hard, enamel can chip, craze or crack if dropped or exposed to thermal shock. Preservation of enamelware requires careful handling, avoidance of sudden temperature changes and expert cleaning to preserve the glossy, glass-like surface.
Above: detail from a Chinese mandala with cloisonné enamel decoration, 15th century
Papier-mâché
Papier-mâché is a lightweight sculptural material made from layers of paper or paper pulp mixed with adhesives such as starch paste or glue. It can be molded, pressed or built up over an armature to create masks, decorative objects, reliefs and lightweight sculptures, then painted or varnished once dry.
Used in Asia since at least the Han dynasty and later popular in 18th and 19th century Europe for decorative wares, papier-mâché became a favoured medium for toys, ornaments and craftwork. Though versatile, papier-mâché is highly sensitive to moisture, warping, insect damage and surface flaking. Papier-mâché conservation requires dry, stable conditions and protection from pests.
Relief
Relief is a sculptural technique in which figures or forms are raised above a flat background, bridging the boundary between two-dimensional and three-dimensional art. Reliefs can range from the very shallow bas-relief to more pronounced high relief (haut-relief), where elements may project significantly from the surface or even appear almost fully in the round. It is typically used in architectural decoration, friezes, plaques and coins.
Pietra Dura
Pietra dura is a stone inlay technique in which thin pieces of semi-precious stones, such as lapis lazuli, agate, jasper, malachite and onyx, are precisely cut and fitted together to create intricate images, patterns or floral designs. The stones are polished flush with the surface, producing visually rich and highly durable decorative panels, tabletops and small objects.
Perfected in Florence at the Opificio delle Pietre Dure, pietra dura adorned Medici commissions and later European luxury furniture and objets d’art.
Above: detail from a pietra dura landscape by the Castrucci workshop, 17th century
Assemblage
Assemblage is an art-making technique in which found objects, everyday materials or three-dimensional elements are combined into a single sculptural composition. Artists may glue, nail, wire or otherwise fasten disparate items together, creating layered works that blend sculpture, collage and installation.
Popularised in the 20th century by artists such as Pablo Picasso, Marcel Duchamp, Louise Nevelson and later Joseph Cornell, assemblage challenged traditional ideas of art by incorporating discarded or non-art materials.
Ormolu
Ormolu is a gilded bronze used for high-quality decorative mounts on furniture, clocks, lighting and small luxury objects. Traditionally, the bronze was coated with a mercury–gold amalgam and heated to evaporate the mercury, leaving a rich, durable layer of gold. The result is a matte or satin gilded surface that allows for fine detail.
Gilt bronze was popular in 18th century France and is typically associated with the baroque, rococo and neoclassical periods. Master bronziers such as Pierre Gouthière and Jean-Claude Duplessis producing mounts for royal furniture and prestigious clockmakers.
Because mercury gilding cannot be replicated safely today, historical ormolu is highly valued. Conservation challenges include tarnishing, surface wear and unstable joints or mounts. Care requires gentle dusting, avoiding abrasive cleaning or polishes and ensuring stable environmental conditions to protect the gilded surface.
Above: detail from an ormolu mask, 18th century
Repoussé
Repoussé is a metalworking technique in which a design is shaped by hammering the metal from the reverse side, raising the forms outward. It is often paired with chasing, which refines details from the front. This method allows artisans to create lightweight yet richly modelled reliefs in gold, silver, copper and other malleable metals.
Marquetry
Marquetry is a decorative woodworking technique in which thin veneers of differently coloured or figured woods are cut and assembled to form images, patterns or pictorial scenes. Applied to furniture and cabinetry, marquetry allows for intricate surface decoration with fine detail and subtle tonal variation.
Ivory
Ivory is a dense, fine-grained material traditionally from the tusks of elephants, though it can also come from mammoths, walrus, narwhal and other species. The smooth texture and ability to hold fine details made it highly prized for small sculpture, religious objects, inlay and a base for portrait miniatures.
Although it remains available in antiques, ivory is now strictly controlled due to the global decline of elephant populations and international trade bans. Ivory preservation challenges include cracking, warping and discolouration. Conservation repairs for missing areas will only be carried out with a synthetic alternative.
Above: detail from a carved ivory box, 10th-11th century
Soapstone / Steatite
Soapstone (or steatite) is a very soft, smooth, talc-rich stone that can be carved with simple tools, making it ideal for small sculptures, figurines, seals and functional objects. Its waxy texture and ability to hold fine detail have made it a popular material across many cultures.
Used since antiquity in seals, amulets, ritual objects and carvings, soapstone has a long global history as a material for both everyday and ceremonial items. Although stable, it scratches easily and can be damaged by heat or oily handling. Conservation requires gentle cleaning, protection from abrasion and avoiding solvent-based treatments that may alter its surface.
Mosaic
A mosaic is a decorative surface created by arranging small pieces of glass, stone, ceramic, or other materials (called tesserae) into patterns or images. Set into mortar or adhesive and often finished with grout, mosaics can be highly durable and are used for floors, walls, furnishings and architectural ornament.
Practised since ancient Greece and Rome, mosaic reached great sophistication in Byzantine churches, Islamic architecture and Italian Renaissance chapels, where glass tesserae and gold leaf created luminous, shimmering surfaces.
Despite their durability, mosaics are vulnerable to loose tesserae, substrate movement, salt damage and surface wear. The preservation of a mosaic requires stabilising the support, securing detached pieces and avoiding harsh cleaning that may dislodge or scratch the tesserae.
Above: detail from a Roman mosaic flood panel, 2nd century
Decoupage
Decoupage is a decorative technique in which cut-out paper images are glued onto a surface and sealed with layers of varnish or lacquer. Popular from the 18th century through the Victorian era, decoupage was used for boxes, trays, furniture and small household objects, and later revived in 20th century craft movements.
Boulle
Boulle work is a luxurious decorative technique combining sheets of tortoiseshell or lacquer with intricately cut brass or gilt-bronze inlays. The contrasting materials are sawn together and arranged in elaborate scrolls, arabesques and floral patterns, creating richly patterned surfaces on furniture, boxes and clocks. Variants include première partie (brass on tortoiseshell) and contre-partie (tortoiseshell on brass).
Named after André-Charles Boulle, master ébéniste to Louis XIV, this technique became a hallmark of French Baroque and continued in production through the 18th and 19th centuries.
Niello
Niello is a black inlay material made from a mixture of silver, copper, lead and sulphur, fused into engraved lines or recesses on silver or gold surfaces. Once polished, it creates a strong contrast between the dark inlay and the bright metal, enhancing fine decorative patterns, lettering or figural designs.
Above: detail from a silver and niello surface from the workshop of Francesco Francia, 15th century
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