Part of The Grand Glossary: A Collector's Reference. This section covers the specialist vocabulary of antique brass, copper, and pewter, from the composition and working characteristics of each metal to the identification of makers’ marks, the assessment of patina, and the principal traditions of British and European base metalwork. Terms are arranged alphabetically within thematic groupings.
Metals and Alloys
Brass
An alloy of copper and zinc, the proportions of which vary according to the intended application and the period of manufacture. Early brasses, made before zinc could be isolated as a pure metal, were produced by the cementation process, in which copper was heated with calamine (zinc carbonate ore); the resulting alloy typically contains 20–30% zinc. Later brasses, made from the late 18th century onwards using metallic zinc, could be produced in more precisely controlled compositions. High-zinc brasses (above 30% zinc) are harder and more yellow; low-zinc brasses are softer, redder, and closer in colour to copper. The working characteristics of brass — its malleability, its ability to be cast, raised, spun, and engraved — made it the dominant material for domestic metalwork across three centuries of British material culture.
Bronze
An alloy of copper and tin, sometimes with small additions of lead, zinc, or other metals. Bronze is harder and more fusible than pure copper, making it better suited to casting. It is distinguished from brass by its tin content and its characteristically darker, warmer colour. In collecting usage, the term bronze is sometimes used loosely to describe copper alloy objects of uncertain composition; for the specific vocabulary of bronze sculpture, see the companion section on Bronze Sculpture.
Copper
A pure metal (or near-pure alloy) of distinctive reddish-pink colour, widely used for domestic and decorative objects from antiquity. Copper is highly malleable and ductile, conducts heat and electricity with exceptional efficiency, and takes a high polish. It was used for cooking vessels, measures, warming pans, and a wide range of domestic and industrial objects. Copper corrodes to form a green or blue-green patina (verdigris) on its surface, which may be a valued indicator of age or an unwanted disfigurement depending on the context. The colour of copper darkens and deepens with age and use, producing a rich, warm tone in untouched pieces.
Latten
A historical term, used from the medieval period to the 17th century, for a copper alloy — broadly equivalent to brass — produced by the cementation process. Latten was the standard material for ecclesiastical metalwork, monumental brasses, aquamaniles, and a wide range of domestic objects in medieval and Tudor England. The term fell out of common use as the production of brass from metallic zinc became established in the 18th century. Collectors and cataloguers of medieval and early modern metalwork use latten as the preferred term for copper-alloy objects of this period.
Ormolu
See the companion entry in the Glossary of Furniture and Woodwork. In the context of base metalwork, ormolu refers specifically to fire-gilded cast bronze or brass mounts, applied to furniture and decorative objects as handles, feet, mounts, and embellishments. The term is used loosely in the trade to describe any gilt-metal mount, but strictly refers only to mercury-gilded (fire-gilded) bronze of French manufacture.
Pewter
An alloy of tin with small additions of other metals — historically lead, antimony, bismuth, and copper in varying proportions depending on the quality and period of manufacture. Pewter is divided into grades: fine pewter (the highest grade, used for flatware) contained tin with small additions of copper and antimony and no lead; trifle pewter (for hollowware) contained more lead; lay or ley metal (the lowest grade) contained a high proportion of lead and was used for objects not intended to come into contact with food. The use of lead in pewter was regulated in England by the Pewterers’ Company from the medieval period. Lead-free pewter, using antimony and bismuth as the principal hardeners, became standard from the 19th century.
Pinchbeck
An alloy of copper and zinc developed by the London clockmaker Christopher Pinchbeck in the early 18th century, in proportions that give it a close resemblance to gold. Pinchbeck was used extensively for jewellery, watch cases, and small decorative objects as an affordable alternative to gold. The term passed into general usage to describe any cheap substitute for a precious metal. Pinchbeck objects are collected in their own right and should not be dismissed as mere imitations; fine examples of pinchbeck jewellery and watch cases are significant collector’s items.
Production Techniques
Casting
The formation of metal objects by pouring molten metal into a prepared mould. In base metalwork, sand casting was the dominant technique for the production of complex forms — candlesticks, andirons, door furniture, and sculptural objects — from the medieval period onwards. A sand mould is formed by pressing a pattern into a fine casting sand contained in a two-part flask; the mould is separated, the pattern removed, and the halves reassembled for pouring. Cast surfaces show a characteristic slightly granular texture; the casting seam — the line where the two halves of the mould met — may be visible unless it has been dressed off. Lost-wax (cire perdue) casting, producing a finer surface, was used for high-quality decorative work.
Chasing
The working of the surface of a metal object from the front with punches and hammers to create decorative relief without removing metal. Chasing compresses and displaces the metal to create the design; it is the complement of repoussé, in which the design is pushed out from the back. Fine chasing can produce extraordinarily detailed work, including the finishing of cast surfaces to remove casting texture and sharpen detail. In pewter, chasing was used sparingly as the soft metal is vulnerable to distortion; in brass and copper it was used more freely.
Engraving
The cutting of a design into the surface of a metal object using a burin or graver, removing metal in a clean groove. Engraving on base metalwork was used for armorial decoration, commemorative inscriptions, pattern work on flatware, and the inscription of ownership marks. The sharpness and precision of engraving, the depth of the cut, and the quality of the design are all indicators of the skill of the craftsman. Engraving may be distinguished from etching (in which the surface is bitten by acid) and from bright-cut engraving, a technique specific to silver in which the tool is worked at an angle to produce faceted cuts that reflect light.
Raising
The shaping of a flat sheet of metal into a three-dimensional hollow form by hammering it over a shaped stake or anvil, working in a spiral from the base upward. Raising compresses and thickens the metal as it is worked up; it requires considerable skill and the piece must be annealed (softened by heating and quenching) at regular intervals to prevent work-hardening and cracking. Raised vessels — jugs, bowls, measures, and flagons — may show hammer marks on their surfaces, which were sometimes planished (smoothed with a flat-faced hammer) and sometimes left as part of the surface texture. Raising is the technique of the coppersmith and the silversmith; cast objects are structurally distinct.
Repoussé
A metalworking technique in which a design is pushed out in relief from the reverse side of a sheet of metal using punches and hammers, the metal being supported on a bed of pitch or sand. Repoussé produces bold, three-dimensional relief that cannot be achieved by chasing alone; the two techniques are typically used in combination, with repoussé establishing the main forms and chasing refining the detail from the front. Repoussé work in copper and brass was used for plaques, panels, and decorative vessels; the technique is also central to high-quality silver work.
Spinning
A technique for forming hollow metal vessels by pressing a flat disc of metal against a rotating wooden or metal former on a lathe, using a smooth tool to force the metal over the form. Spinning produces thin-walled, lightweight vessels with a characteristic concentric turning line on the interior surface. It became economically important in the 19th century, enabling the rapid production of simple hollow forms. Spun objects may be identified by the turning lines inside the vessel and by the evenness of their wall thickness; raised objects have slightly uneven walls that reflect the hand process.
Pewter Marks
Touch Mark
The personal mark of a pewterer, struck on a piece with a stamp to identify its maker, equivalent in function to the hallmark system in silver. English pewterers were required by the Pewterers’ Company to register their touch marks on the touchplates maintained at Pewterers’ Hall in London from the late 16th century. The London touchplates, preserved from 1668 onwards, are the primary reference for the identification of English pewter makers. Provincial pewterers used their own marks, some of which are documented and some of which remain unidentified. Scottish, Irish, and continental pewterers used their own distinct mark systems.
Quality Marks
Additional marks applied to pewter to indicate the grade of the metal, distinct from the maker’s touch. The crowned X mark, or ‘X’ with a crown, was used by English pewterers from the 17th century to indicate fine pewter of a quality above the standard. The ‘rose and crown’ mark was used on export pewter and also appears on some high-quality domestic wares. Pseudo-hallmarks — a set of small stamps imitating the hallmark system used on silver — were applied to pewter from the late 17th century and should not be confused with genuine silver hallmarks.
Capacity Marks
Marks stamped on pewter measures to certify that they conform to the legal standard of capacity, applied by the relevant authority following verification. English capacity marks include the excise mark (from 1699), the sovereign’s head, and various local verification stamps. The presence of capacity marks on a measure confirms its use in trade and adds to its historical interest. The sequence of marks on a well-documented measure can provide a chronological record of its use and successive verifications over a long period.
Principal Object Types
Alembic
A vessel used in distillation, consisting of a cucurbit (the lower vessel containing the material to be distilled) and a capital or head (the upper vessel that condenses the vapour), connected by a tube or beak. Alembics were made in copper and glass from the medieval period. Copper alembics from apothecaries, distillers, and alchemists’ laboratories are collected as instruments of material culture; their identification and dating requires knowledge of the history of chemistry and distillation.
Candlestick
One of the most extensively collected categories of domestic metalwork, produced in pewter, brass, and bronze from the medieval period to the present day. The form of the candlestick — the shape of the base, the profile of the column, the form of the socket and grease pan — evolved in a broadly datable sequence, though regional variations and the persistence of conservative forms complicate simple dating by form alone. Medieval and Tudor candlesticks with pricket (spike) sockets predate the widespread adoption of the socket form; ejector candlesticks, with a push-rod mechanism to eject the candle stub, are characteristic of the late 17th and 18th centuries.
Charger
A large flat plate or dish, typically of pewter or copper, used for serving or display. Pewter chargers from the 17th and early 18th centuries — with broad, flat rims decorated with multiple reeded lines — are among the most collected of all pewter forms. The condition of the rim decoration, the presence of the maker’s touch on the back, and the quality and evenness of the casting are the primary criteria for assessment.
Flagon
A lidded vessel for serving liquids, made in pewter, silver, and base metals, used in both domestic and ecclesiastical contexts. Pewter flagons for church use — produced in considerable numbers from the mid-16th century — are among the most historically significant and collected categories of English pewter. Forms vary by period and denomination; Scottish communion flagons in pewter have their own distinct typology. The condition of the lid hinge and thumbpiece, the integrity of the body, and the presence of the maker’s mark are the principal assessment criteria.
Measure
A vessel made to a specific legal standard of capacity for use in trade, produced in pewter, brass, and later britannia metal in a wide range of standard sizes. English measures are found in baluster form (the dominant English type from the 17th century, with a characteristic bulbous body and scrolled thumbpiece), bellied form, and the later bud and acorn forms of the 19th century. Scottish measures have their own distinct forms, including the thistle measure. Irish haystack and noggin measures are a recognised collecting category. Capacity marks and touch marks on a measure provide a documentary record of its use and authentication.
Patina and Condition
Lacquering
The application of a clear or tinted lacquer to the surface of brass or copper to protect the polished surface from oxidation. Lacquering was common on decorative brassware from the 18th century onwards and on scientific instruments. Old lacquer develops a characteristic amber or golden tone with age and may craze, crack, or lift from the surface over time. The removal and replacement of old lacquer is a common restoration intervention; its presence or absence, and the age of the lacquer, are factors in the assessment of a piece. Original lacquer in good condition is preferable to polished, relacquered surfaces for most collecting purposes.
Patina (Base Metals)
The surface colour and texture acquired by brass, copper, and pewter through age, use, and exposure to the atmosphere. In copper, the natural patina ranges from a warm reddish-brown to a deep, almost chocolatey surface in untouched examples; verdigris (the green copper carbonate that forms in damp conditions) is a distinct phenomenon. In brass, old patina produces a deep, honey-golden colour quite different from the brassy yellow of polished or new metal. In pewter, a natural grey patina develops over time; excessively bright, shiny pewter has usually been polished and the surface layer of original material removed. Original, undisturbed patina is the most important indicator of an unrestored piece and is irreplaceable once removed.
Pitting
Small pits or craters in the surface of a metal object, caused by localised corrosion, casting defects, or the mechanical removal of embedded inclusions. Surface pitting is a common condition issue in base metalwork, particularly in cast brass and pewter objects that have been buried or stored in damp conditions. Light surface pitting that does not penetrate the wall of a vessel or significantly affect the appearance of a piece is generally considered a minor condition issue; deep or extensive pitting weakens the object and reduces value.
Repairs
Interventions to restore the structural integrity or appearance of a damaged object, including soldering, patching, filling, and reseating of joints and hinges. Old repairs — particularly on pewter, which is relatively soft and easily damaged — are common and do not necessarily significantly affect value if well executed and honestly disclosed. Later repairs using inappropriate materials (epoxy adhesives, modern solder) are more objectionable. The condition of lids, hinges, spouts, and handles is particularly important in hollow vessels.
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