What color is blue ? Blue is one of the three primary colors within the RGB color model and can be created by combining cyan and magenta within the CMYK color model. Blue is associated with feelings of calmness and tranquility, reflecting the appearance of the sky and large bodies of water. Below, you’ll find different shades of blue with names and their respective Hex, RGB, and CMYK codes if you want to use the colors for your website or design. Turquoise is a color that is related to the gemstone of the same name. Turquoise also has many different variations to it as listed below. A list of BLUE color codes and shades of blue for HTML, CSS and website development with HEX and RGB codes. Blue is associated with trust and dependability. It is also associated with elegance. Studies suggest that blue can have a calming effect on the mind and body. Explore the different shades of blue colors (colors that belong to the blue color family).