visible light - Why is the bottom part of a candle flame blue

What’s the explanation behind the bottom part of a candle flame being blue? I googled hard in vain. I read this. I don’t understand how it’s explained by the emission of excited molecular radicals

Candles: What do they emit when lit? Office for Science and Society - McGill University

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Draw a labelled diagram of a candle flame and explain what happens in each zone.

What shape would a candle's flame be in zero gravity?

The science of candles - Explain that Stuff

Candle flame - Introduction, Components, Structure with Videos