If flame follows the color shade of red to white for cold to hot, why is there suddenly a blue flame ?

Red flame has the coldest temperature wheres white flame has the hottest temperature. In between there is the orange flame, the yellow flame and suddenly the blue flame comes right before the white one. Could anyone explain this phenomenon?

The color of a flame is an emission spectrum, not a black body spectrum. The color lines of an emission spectrum are unique to each element in the burning gas and independent of the temperature.

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