Slo-Mo Footage
Slo-Mo Footage

The atoms in the crystalline sugar molecules lose electrons which end up closing with the Nitrogen in the air.As the nitrogen absorbs energy from those electrons that is generally end up with the colliding with nitrogen molecules.

Generally the light emitted is mostly ultraviolet,which is not seen  by the human eyes.

It generally absorbs the ultraviolet light emitted by the nitrogen molecules and then re-emit it as the light in the spectrum.