A Rainbow Fire
November 21, 2017


Despite Detector Inspector being based around fire prevention, we can still appreciate the interesting aspects and unique beauty of fire.

For instance, have you ever wondered why some fires produce different colours flames?

The color of a fire’s flame depends on several different conditions; temperature, chemical composition, and the amount of oxygen present. Since combustion occurs, and varies with the presence of air, different parts of the flame have different colours depending upon the availability of air to support combustion.

Normally the hotter parts, closer to the burning fuels, will be whitish-blue; the more distant parts, on the other hand, will be cooler and hence orange-reddish.

The nature of the fuel and its chemical composition can also affect the colour of the flame. This is because when excited, every element can emit light; the wavelength, and hence the colour, of the emitted light is characteristic of each element.

Wood, natural gas, and oil, will emit light which will fall in the blue region. Lithium gives a pink flame, while Copper gives a green flame. Combining these chemicals in the correct combination can even produce a rainbow fire!

Apart from looking cool, the colour of a flame is also a quick way to determine the heat of a fire.

Below is a method to help you determine the heat of a wood, natural gas or oil-lit fire:

Just visible: 525 °C
Dull: 700 °C
Cherry, dull: 800 °C
Cherry, full: 900 °C
Cherry, clear: 1,000 °C

Deep: 1,100 °C
Clear: 1,200 °C

Whitish: 1,300 °C
Bright: 1,400 °C
Dazzling: 1,500 °C

We hope you are just as interested in fire as we are!

The Detector Inspector Team