What color flame does sulfur produce when burned in air?

When sulfur is burned in air, it produces a blue flame. This blue color is indicative of the presence of sulfur dioxide (SO₂) formed during the combustion reaction. The reaction of sulfur with oxygen from the air generates the gas, which is a characteristic product of sulfur combustion and contributes to the blue hue of the flame.

The yellow/orange flame typically associated with burning materials like carbon is not present here because sulfur does not contain carbon, which is responsible for that particular color. The other colors mentioned—white and red—do not correspond to sulfur’s combustion, as they are often linked to different substances or reactions. Thus, the blue flame is distinct and is an identifying feature of sulfur burning in air.