A faint tint of gray: colorfulness (OKLCH chroma) up to 0.031 but not a perfect gray, at lightness (OKLCH L) from 41% to 83%.
In Hexdle, this comes up 1 in 78 a roll. It's one of 5 badges in its family, and a roll counts at most one of them.
A color a day, free, no account needed.