Red represents power and courage. It has a strong impact on our emotions with the range from love to anger, passionate and violance. This color is highly visible which can focus attention quickly and make people to take quick decisions. May be this is the reason why fire engines are usually painted red.
Monochromatic color schemes are based from a single hue and extended using its shades, tones and tints that becomes a Monochromatic colors.
If your are looking for a Red Monochromatic colors, here are some attractive collection of red color shades with HEX, RGB and CMYK codes.