There are colors of food and then there are substances that advertise themselves to change the color of food. One is an inherent characteristic, the other is just plain strange.
Coffee is not naturally white. Blue cheese is naturally blue due to the strains of mold culture used to process it. If they sold cheese bluing, I'd probably run the other way. Bluing was a laundry product you put in with your clothes to make your whites whiter. I think old grey haired ladies used some kind of bluing to make their hair snowy white.
I don't think of white as a flavor. The idea that you'd want to "whiten" your coffee instead of enhance the flavor and protect the lining of your stomach with some cream seems somehow off to me. Lead white could whiten your coffee, too, but I don't think I'd recommend it.
