Any natural gas with small amount of oxygen within it. This is called a combustible gas. When you turn a stove on, the flame heats up the metal separator below and oxidizes the molecules in the gas, letting off light that we see as orange to blue-white in color (depending on what metal it’s coming off of).
A green flame is when there are elemental impurities in any form inside the fuel like nitrogen gas or carbon monoxide mixed into it which results in this difference in color between what we usually see from hot lighting since those colors actually emanate from different atomic levels of energy as they are heated at different rates.
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