ALEXANDER LOWRY / SCIENCE PHOTO LIBRARY ALEXANDER LOWRY / SCIENCE PHOTO LIBRARY
Close-up of the flame of a candle. A candle consists of a vertical cylinder of wax, such as tallow or paraffin wax, with a central wick of string. A flame applied to the end of the wick produces a luminous flame which melts the wax. The wick is treated with a substance such as alum so that it carbonises but does not rapidly burn out.
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