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

Structure of Flame

What about flame of candle under zero gravity? - GIGAZINE

Candle Flame

How To Read and Interpret How Your Ritual Candle Burns

Candle Science - National Candle Association

How to Interpret Candle Flame Meanings: 12+ Spiritual Signs

Fire II: Color and Temperature - Maggie Maggio

Prayer Candle: What Does it Mean When a Candle Burns Slow or Fast?

Candle Under Glass Experiment - 5 Minute Science Project Idea

Candle Science - National Candle Association

What Makes a Candle Flame? - ChemistryViews

Candle flame - Introduction, Components, Structure with Videos

Photographing candle flames - Photofocus

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

Does Fire Have a Shadow?