Hob Gas burning bright orange?

Our hob gas usually burns blue, just yesterday for a short while it was burning bright orange on all rings. I assume an inpurity in the gas, after 5mins it was burning blue again.

Is anyone able to offer an explanation about why this happened?

Answer:
Gas while burning does not get sufficient oxygen / air, it burns with yellow flame. If it gets sufficient oxygen / air , it burns blue.

The flames on most burners that use a gaseous fuel such as natural gas or liquified petroleum gas should burn steadily with a clear, blue flame, except for special designs such as fireplace logs and torches. A wavering, yellow flame on a normal gas burner indicates that the burner is out of adjustment or the air inlet is restricted. As a result, the burner may be producing excessive amounts of CO. However, the flames in burners that use fuel oil should burn with a clear yellow or orange flame . This is an indication of good combustion in equipment that burns fuel oil.
que?
Either an impurity or a slight blockage to the air vents leading to excess carbon in the flame, leading to that bright orange color. If the vents got a temporary block, it can happen.
it didn't have a sufficient supply of oxygen. This can be caused by a simple thing such a normal salt (sodium chloride).

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