On this Wikipedia the language links are blue curacao non alcoholic substitute the top of the page across from the article title. This article is about the colour. Blue has been an important colour in art and decoration since ancient times.

The semi-precious stone lapis lazuli was used in ancient Egypt for jewellery and ornament and later, in the Renaissance, to make the pigment ultramarine, the most expensive of all pigments. Surveys in the US and Europe show that blue is the colour most commonly associated with harmony, faithfulness, confidence, distance, infinity, the imagination, cold, and occasionally with sadness. In US and European public opinion polls it is the most popular colour, chosen by almost half of both men and women as their favourite colour. In heraldry, the word azure is used for blue. Several languages, including Japanese and Lakota Sioux, use the same word to describe blue and green. English speakers would refer to as green, such as the colour of a traffic signal meaning “go”.

For more on this subject, see Distinguishing blue from green in language. Linguistic research indicates that languages do not begin by having a word for the colour blue. Blues with a higher frequency and thus a shorter wavelength gradually look more violet, while those with a lower frequency and a longer wavelength gradually appear more green. Pure blue, in the middle, has a wavelength of 470 nanometres. Isaac Newton included blue as one of the seven colours in his first description the visible spectrum. He chose seven colours because that was the number of notes in the musical scale, which he believed was related to the optical spectrum.