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Candles, Candle Holders
A candle is a light source usually consisting of an internal wick which rises through the center of a column of solid fuel. Prior to the mid 19th century, the majority of candles were tallow (a byproduct of beef fat rendering). more...
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The fuel now is nearly always some form of wax, with paraffin wax being the most common. Gel, soy and vegetable-based candles are also available. A candle manufacturer is usually known as a chandler.
Prior to the candle being ignited, the wick is saturated with the fuel in its solid form. The heat of the match or other flame being used to light the candle first melts and then vaporizes a small amount of the fuel. Once vaporized, the fuel combines with oxygen in the atmosphere to form a flame. This flame then provides sufficient heat to keep the candle burning via a self-sustaining chain of events: the heat of the flame melts the top of the mass of solid fuel, the liquified fuel then moves upward through the wick via capillary action, and the liquified fuel is then vaporized to burn within the candle's flame.
The burning of the fuel takes place in several distinct regions (as evidenced by the various colors that can be seen within the candle's flame). Within the bluer, hotter regions, hydrogen is being separated from the fuel and burned to form water vapor. The brighter, yellower part of the flame is the remaining carbon soot being oxidized to form carbon dioxide.
As the mass of the solid fuel is melted and consumed, the candle grows shorter. Portions of the wick that are not evaporating the liquid fuel are, ideally, consumed in the flame, limiting the exposed length of the wick and keeping the temperature and rate of fuel consumption even. Some wicks require manual trimming with scissors or a wick trimmer for even burning, but these are rarely found in modern candles.
History
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Candles were developed independently in many countries. The Egyptians and Cretans made candles from beeswax, as early as 3000 BC. Early candles were made from various forms of natural fat, tallow, and wax. In the 18th century, spermaceti, an oil produced by the sperm whale, was used to produce superior candles. Late in the 18th century, colza oil and rapeseed oil came into use as much cheaper substitutes. Paraffin was first distilled in 1830, and revolutionized candle-making, as it was an inexpensive material which produced high-quality, odorless candles that burned reasonably cleanly and were used during the colonial days. The industry was devastated soon after, however, by the distillation of kerosene (confusingly also called paraffin oil or just paraffin). This excellent fuel for lamps relegated candles to their current status as primarily decorative items.
Usage
Prior to the domestication of electricity, candles were a common source of lighting, before, and later in addition to, the oil lamp. Due to local availability and the cost of resources, for several centuries up to the 19th century candles were more common in northern Europe, and olive oil lamps more common in southern Europe and around the Mediterranean Sea. Makers of candles were known as chandlers.
Read more at Wikipedia.org
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