Teal is a low-saturated color, a greenish-to dark medium, similar to medium green and dark cyan. It can be created by mixing green with blue into a white base, or deepened as needed with a little bit of black or gray color. The complementary color of teal is coral. It is also one of the initial group of 16 HTML/CSS web colors formulated in 1987.
The first recorded use of teal as a color name in English was in 1917.
Its name is derived from the Middle English tele, a word akin to the Dutch taling and the Middle Low German telink. As a color, its name is believed to have been taken from the small freshwater Common Teal, a member of the duck family whose eyes are surrounded by this color.
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Teal blue is a medium tone of teal with more blue. The first recorded use of teal blue as a color name in English was in 1927.
The source of this color is the Plochere Color System, a color system formulated in 1948 that is widely used by interior designers. Teal was subsequently a heavily used color in the 1950s and 1960s.
The Seattle Mariners use a variant shade of teal called "Northwest Green" as an official team color. The team also wears an alternate jersey using the color for Monday and Friday home games at Safeco Field.