If you compare white light to the other colors you'll realize... white consists of all the colors in one. It contains all the colors in the spectrum in one color. It is the one color that is everything.
You decide white light is the ultimate color. You decide you want to put it on all things to make everything white. "What a great idea," you think. You try to put it on everything and you nearly succeed... except, the miners (みな). They keep getting dirty doing all their mining things. NOOO, your plan is ruined!