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The blue flame is called a roaring flame and the yellow flame is called the safety flame.
A yellow flame is named as a safety flame as it isn't as hot as the blue flame
Blue flame is a clean flame.
Blue Flame=Can't see (hotter then yellow flame) Yellow Flame (safety flame)=visible
A Safety Flame Is The Yellowy Orange Flame. It Is Called A Safety Flame Because You Can See It Unlike The Blue Flame