Sheffield plate is a layered combination of silver

Silver

Silver is a metallic chemical element with the chemical symbol Ag and atomic number 47. A soft, white, lustrous transition metal, it has the highest electrical conductivity of any element and the highest thermal conductivity of any metal...

 and copper

Copper

Copper is a chemical element with the symbol Cu and atomic number 29. It is a ductile metal with very high thermal and electrical conductivity. Pure copper is soft and malleable; an exposed surface has a reddish-orange tarnish...

 that was used for many years to produce a wide range of household articles. These included button

Button

In modern clothing and fashion design, a button is a small fastener, most commonly made of plastic, but also frequently of seashell, which secures two pieces of fabric together. In archaeology, a button can be a significant artifact. In the applied arts and in craft, a button can be an example of...

s, caddy spoon

Spoon

A spoon is a utensil consisting of a small shallow bowl, oval or round, at the end of a handle. A type of cutlery , especially as part of a place setting, it is used primarily for serving. Spoons are also used in food preparation to measure, mix, stir and toss ingredients...

s, serving utensils, candlestick

Candlestick

A candlestick, chamberstick, or candelabrum is a holder for one or more candles, used for illumination, rituals, or decorative purposes. The name 'candlestick' derives from the fact that it is usually tall and stick-shaped.Candlesticks are also called candle holders...

s and other lighting devices, tea and coffee services, serving dishes and tray

Tray

A tray is a shallow platform designed for carrying things. It is larger than a salver, a diminutive version commonly used for lighter and smaller servings, and it can be fashioned from numerous materials, including silver, brass, sheet iron, wood, melamine, and papier-mâché...

s, tankard

Tankard

A tankard is a form of drinkware consisting of a large, roughly cylindrical, drinking cup with a single handle. Tankards are usually made of silver, pewter, or glass, but can be made of other materials, for example wood, ceramic or leather. A tankard may have a hinged lid, and tankards featuring...

s and pitchers

Pitcher (container)

A pitcher is a container with a spout used for storing and pouring contents which are liquid in form. Generally a pitcher also has a handle, which makes pouring easier.A ewer is a vase-shaped pitcher, often decorated, with a base and a flaring spout...

, and larger items such as soup tureen

Tureen

A tureen is a serving dish for foods such as soups or stews, often shaped as a broad, deep, oval vessel with fixed handles and a low domed cover with a knob or handle. Over the centuries, tureens have appeared in many different forms, some round, rectangular, or made into fanciful shapes such as...

s and hot-water urns. Almost every article made in sterling silver

Sterling silver

Sterling silver is an alloy of silver containing 92.5% by mass of silver and 7.5% by mass of other metals, usually copper. The sterling silver standard has a minimum millesimal fineness of 925....

 was also crafted by Sheffield makers, who used this manufacturing process to produce nearly identical wares at far less cost.
The material was accidentally invented by Thomas Boulsover

Thomas Boulsover

Thomas Boulsover , Sheffield cutler and the inventor of Sheffield Plate, was born in what is now the Ecclesfield district of the city and died at his home at Whiteley Wood Hall, on the River Porter....

, of Sheffield

Sheffield

Sheffield is a city and metropolitan borough of South Yorkshire, England. Its name derives from the River Sheaf, which runs through the city. Historically a part of the West Riding of Yorkshire, and with some of its southern suburbs annexed from Derbyshire, the city has grown from its largely...

's Cutlers Company

Company of Cutlers in Hallamshire

The Company of Cutlers in Hallamshire is a trade guild of metalworkers based in Sheffield, England. It was incorporated in 1624 by an Act of parliament. The head is called the Master Cutler...

, in 1743.