Teal (#008080) is a medium, highly saturated cyan hue. Teal is a dark cyan named after a duck with teal-coloured eye stripes; it reads as calm and trustworthy, which is why clinics love it.
In RGB it is made of 0 red, 128 green and 128 blue. Its HSL hue angle is 180° with 100% saturation and 25% lightness, while its perceptual OKLCH lightness is 54% with a chroma of 0.093. For print, a starting CMYK mix is 100% cyan, 0% magenta, 0% yellow and 50% black.
As a text color on white, Teal has a contrast ratio of 4.77:1, which passes WCAG AA for normal text. On black it reaches 4.4:1 and passes AA only for large text. If you use Teal as a background, put white text on it. The APCA lightness contrast is Lc 32 for black text and Lc -78 for white text.
Its perceptual complement is #9E585E, close to rose gold. Colors that look most similar are cerulean, sea green, slate gray. It looks fairly similar to people with red-green color blindness (ΔE 9), so its meaning mostly survives.