Bain-marie

A bain-marie on a stovetop

A bain-marie (pronounced: [bɛ̃ maʁi]; also known as a water bath or double boiler), a type of heated bath, is a piece of equipment used in science, industry, and cooking to heat materials gently and gradually to fixed temperatures, or to keep materials warm over a period of time. A bain-marie is also used to melt ingredients for cooking.

Description

Schematic of an improvised double boiler, as used in outdoor cooking

The bain-marie comes in a wide variety of shapes, sizes, and types, but traditionally is a wide, cylindrical, usually metal container made of three or four basic parts: a handle, an outer (or lower) container that holds the working fluid, an inner (or upper), smaller container that fits inside the outer one and which holds the material to be heated or cooked, and sometimes a base underneath. Under the outer container of the bain-marie (or built into its base) is a heat source.

Typically the inner container is immersed about halfway into the working fluid.

The smaller container, filled with the substance to be heated, fits inside the outer container, filled with the working fluid (usually water), and the whole is heated at, or below, the base, causing the temperature of the materials in both containers to rise as needed. The insulating action of the water helps to keep contents of the inner pot from boiling or scorching.

When the working fluid is water and the bain-marie is used at sea level, the maximum temperature of the material in the lower container will not exceed 100 degrees Celsius (212 °F), the boiling point of water at sea level. Using different working fluids (oils, salt solutions, etc.) in the lower container will result in different maximum temperatures.

Alternatives

A contemporary alternative to the traditional, liquid-filled bain-marie is the electric "dry-heat" bain-marie, heated by elements below both pots. The dry-heat form of electric bains-marie often consumes less energy, requires little cleaning, and can be heated more quickly than traditional versions. They can also operate at higher temperatures, and are often much less expensive than their traditional counterparts.

Electric bains-marie can also be wet, using either hot water or vapor, or steam, in the heating process. The open, bath-type bain-marie heats via a small, hot-water tub (or "bath"), and the vapour-type bain-marie heats with scalding-hot steam.

Culinary applications

An improvised bain-marie being used to melt chocolate

Other uses

In small scale soap-making, a bain-marie's inherent control over maximum temperature makes it optimal for liquifying melt-and-pour soap bases prior to moulding into bars. It offers the advantage of maintaining the base in a liquid state, or re-liquifying solidified base, with minimal deterioration. Similarly, using a water bath, traditional wood glue can be melted and kept in a stable liquid state over many hours without damaging the volatile saps and resins it incorporates.

History

An alchemical balneum Mariae from Coelum philosophorum, Philip Ulstad, 1528, Chemical Heritage Foundation

The name comes from the medieval-Latin term balneum (or balineum) Mariae — literally, Mary's bath — from which the French bain de Marie, or bain-marie, is derived. The device's invention has been popularly attributed to Mary the Jewess, an ancient alchemist. However, the water bath was known many centuries earlier (Hippocrates and Theophrastus).[2]

See also

References

  1. "Techniques: Bain Marie". DrGourmet.com. Archived from the original on 4 June 2011. Retrieved 2011-07-20.
  2. Edmund Lippmann (1919), Entstehung und Ausbreitung der Alchemie, Springer, p. 50
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