You can see the color white and you can hear white noise but you can also smell a white odor, says new research.
When we see white, we are seeing a mixture of light waves of different wavelengths. The hum we call white noise is a combination of assorted sound frequencies but in both cases a stimulus must meet two conditions: The mix that produces them must span the range of our perception and each component must be present at the exact same intensity.
Both of these conditions can be met with odors, so as to produce a white smell - it just involves technical difficulties, like getting the intensities of all the scents to be identical.