This was my immediate thought a few paragraphs in. In my head, I was thinking, "That wastes a lot of energy, and you have to pick your color at purchase time."

This was my immediate thought a few paragraphs in. In my head, I was thinking, "That wastes a lot of energy, and you have to pick your color at purchase time." Why not formulate a combination of fluids that requires less heat to operate, and use a multicolor LED for infinite colors?