White is the presence of all colors and black is the absence of all color if you're looking at the light spectrum definition. It's opposite if you're talking to an artist. If you're talking to a quilter it's definitely a color and like any other color, there are many shades of it.
Wouldn't you have to mix some yogurt with the ketchup to make it into a real smoothie? A blueberry/ketchup smoothie???? I'll pass