Why is the color of the windproof lighter different from the normal one?

Update:19-07-2019
Summary:

The secret lies in the material of the flame wire. Ever […]

The secret lies in the material of the flame wire. Everyone who has studied chemistry should know that the flame color produced by the burning of certain metals or their compounds in a colorless flame is different. For example, the flame color of sodium is light yellow, the flame color of potassium is purple, and the copper is green...

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