Burning of calcium produces dark orangish red flame.
If a pan of milk boils over on a gas stove, the flame turns a dark orangish-red because of the burning of calcium in the fire. Different substances produces different colors on burning. When copper is heated it produces a blue flame, lithium and strontium produces a red flame, calcium produces an orange flame, sodium formed a yellow flame, and barium a green flame.
So when the milk is heated and some milk drop on the stove then the flame turns a dark orangish-red colour due to calcium present in the milk so we can conclude that burning of calcium produces dark orangish red flame.
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