How hot is a blue flame?

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Keeping this in consideration, is blue flame hotter than magma?

No. Fire can get hotter than Magma, it's not hotter by default. It's dependant on its fuel source. Moreover, what's the difference between blue fire and red fire? Hotter fires burn with more energy which are different colors than cooler fires. Although red usually means hot or danger, in fires it indicates cooler temperatures. While blue represents cooler colors to most, it is the opposite in fires, meaning they are the hottest flames.

And another question, what does flame symbolize?

It is often the symbol of inspiration, and yet it is also the predominant symbol of HELL; fire is the only one of the "FOUR ELEMENTS" that humans can produce themselves, so it bridges the connection between mortals and gods. What does the Bible say about lighting a candle? Psalms 18:28 says, "For thou wilt light my candle: the LORD my God will enlighten my darkness."

One may also ask what does candle symbolize in love?

While used in many religious and cultural celebrations, candles also offer their own unique symbolism. For example, the warmth of a candle offers a sense of support and love while the light of a candle creates a feeling of optimism.