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Darker shades of blue include ultramarine, cobalt blue, navy blue, and Prussian blue; while lighter tints include sky blue, azure, and Egyptian blue (for a more complete list see the List of colours).

Blue is a basic colour term added to languages after black, white, red, yellow, and green. The term blue derives from Proto-Germanic blæwaz and Old French blo or bleu.

BLUE definition: the pure color of a clear sky; the primary color between green and violet in the visible spectrum, an effect of light with a wavelength between 450 and 500 nanometers. See …

BLUE definition: 1. of the colour of the sky without clouds on a bright day, or a darker or lighter type of this…. Learn more.

If you are feeling blue, you are feeling sad or depressed, often when there is no particular reason.

If you’re American or European, blue might be your favorite color (it wins the polls as most popular), but did you know that it has a long and fascinating history? From barbarians, to …

Apr 24, 2025 · Once used to treat malaria, methylene blue is gaining attention for a range of health-related uses. Learn where it started, how it works, and what the evidence says about its …

Blue is the favorite color of all people. It’s nature’s color for water and sky, but is rarely found in fruits and vegetables. Today, blue is embraced as the color of heaven and authority, denim …

Blue is one of the colors of the rainbow that people can see. It is one of the primary colors (colors that can be mixed with other colors) of light, along with red and green.