Candle is a daily lighting tool, mainly made of paraffin. In ancient times, it was usually made of animal fat. It can burn and glow. In addition, candles are widely used: they are also very important in birthday parties, religious festivals, collective mourning, weddings, funerals and other activities. In literary and artistic works, candles are symbolic of sacrifice and dedication.

The main raw material of candles is paraffin wax (CH), which is made from waxy fractions of petroleum by cold pressing or solvent dewaxing. It is a mixture of several higher alkanes, mainly n-docosane (C22H46) and n-octacosane (C28H58), containing about 85% carbon and 14% hydrogen.

Accessories added include white oil, stearic acid, polyethylene, essence, etc. Among them, stearic acid (C 17H35COOH) is mainly used to improve the softness, and the specific addition amount depends on what kind of candles are produced.

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There are many kinds of candles, which can be generally divided into two categories according to the purpose of use: daily lighting candles (ordinary candles) and handicraft candles (special purpose candles).

The flame of a candle is divided into three parts: outer flame, inner flame and flame core. The outer flame temperature is the highest, the flame center temperature is the lowest, and the inner flame brightness is the highest.

Candles can be generally divided into extruded cylindrical wax, pointed bamboo wax, torch wax, floating wax, round head wax, flat head wax, etc., and there are many colors.

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