The human eye contains rods and cones sensitive to red, green and blue tints. Because the eye is so sensitive to these specific hues, primary colours like blue can fall into a vast collection of shades and hues.
Midnight and Navy
One of the darkest blues, midnight blue takes its name from its almost black colour. The midnight blue colour is somewhat reminiscent of a night sky and somewhat darker than the darkest shade of navy blue. Navy blue is slightly lighter than midnight blue but still among the darkest of blue hues. The name of navy blue dates back to a 1745 colour choice by King George II of England and has served as the colour of naval uniforms since, according to the official history of the U.S. Navy.
Cornflower and Slate Blue
A decidedly medium blue, cornflower is reminiscent of a clear summer sky. The colour falls in the middle of many colour charts and carries the hexadecimal colour code 6495ed. The colour of pure, undyed slate, slate almost resembles a light purple rather than a true blue. Slate blue can fall into a number of variations that include light slate and medium slate, according to Taylored Marketing.
Royal blue presents a deep, rich hue popular with many royal families throughout history. A popular colour due to its rich appearance, royal blue carries the hexadecimal colour code 4169e1.
A few shades lighter than cornflower blue, this colour evokes memories of a cloudless spring or late autumn sky. Taylored Marketing points out that sky blue is available in several variants that include deep sky and light sky.
Steel blue appears as a mix between a blue and a grey and may take its name from its greyish undertones. The hexadecimal colour code for steel blue is 4682b4.
A colour so widely recognised that it appears in at least one pop music song, electric blue is a vivid shade intended to resemble the colour of lightning or an arc of electricity.
Cobalt blue is also a vivid hue of medium blue but is somewhat more diffused. The colour takes its name from the natural shade of cobalt.
Delft is somewhat more diffused than cobalt. Colour experts at Eternal Silk indicate that delft blue can be further divided into shades like delft blue medium, delft medium dark and light delft. Copenhagen blue is somewhat darker than delft blue but equally diffused with shades of white and grey; this hue is available in light and dark shades. The colour of the ocean, ocean blue resembles the bluish green mix found in large bodies of water. Ocean blue is a popular colour with several available shades like dark, medium and light. Indigo is a deep and dark shade of blue that approaches the purple spectrum. Many automotive manufacturers use this shade for its high visibility in instrumentation. Blueberry carries the vivid, deep colour of the wild berries. This colour can fall into several shades that resemble the berry's colours as it matures. Finally, cyan is a vivid light blue shade that blends easily with other colours to create new shades.
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