Powder Blue (#B0E0E6) is a very light, moderately saturated cyan hue. Powder blue is a pale greyish blue, named after a historic pigment powder.
In RGB it is made of 176 red, 224 green and 230 blue. Its HSL hue angle is 187° with 52% saturation and 80% lightness, while its perceptual OKLCH lightness is 88% with a chroma of 0.050. For print, a starting CMYK mix is 23% cyan, 3% magenta, 0% yellow and 10% black.
As a text color on white, Powder Blue has a contrast ratio of 1.43:1, which fails WCAG AA even for large text. On black it reaches 14.65:1 and passes AA for normal text. If you use Powder Blue as a background, put black (or very dark) text on it. The APCA lightness contrast is Lc 83 for black text and Lc -24 for white text.
Its perceptual complement is #F6CAC5, close to millennial pink. Colors that look most similar are baby blue, sky blue, electric blue. It looks fairly similar to people with red-green color blindness (ΔE 5), so its meaning mostly survives.