Why do use red color for firing vehicles ??

Red was originally selected for the same reason. Over a century ago, red was a nice bright color that set fire apparatus apart from most vehicles on the road. Red became traditional, and most fire departments stayed with it. Some firefighters like yellow trucks, some prefer traditional red.

Because red was the most expensive color of paint, volunteers used red to make their fire trucks stand out as a source of pride. ... In the early 1900s, Ford only offered cars in black, so red fire trucks would be sure to stand out amidst the sea of black vehicles on the road.

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no, the red giant is the hottest with 2.00.000.000 degrees celsius. while the white dwarf only 25,000 degrees celsius.