Solid nitrogen is a colorless substance. This is due to the lack of electronic transitions in the solid state that would absorb or emit light at visible wavelengths. The colorless nature of solid nitrogen is consistent with the properties of other diatomic gases, such as oxygen and hydrogen, which also remain colorless when condensed into their solid forms. The data supporting this is derived from experimental observations and spectroscopic analysis, which have consistently shown that nitrogen does not exhibit any color in its solid state.