Most people have heard of "white noise", but have you heard of "white scent"?
Scientists have created a smell called “olfactory white”, made by mixing 40 or more odor compounds in equal amounts. The researchers created four different olfactory white blends, none of which shared any common ingredients. Test subjects consistently identified them as the same scent!!
Perhaps the next burning question is: What does olfactory white smell like? Unfortunately, the scent is so bland as to defy description.