Red does not combine with any color to create blue because blue is a primary color and cannot be made by mixing other colors. In the world of color theory, primary colors—red, blue, and yellow—are the building blocks of all other colors, and they stand on their own. If you mix red with other colors, you might create shades like purple (red + blue) or orange (red + yellow), but blue remains an independent hue. If you’re thinking about achieving a “cooler” red or something that leans blue, you’d need to shift toward purple tones rather than pure blue.