Pilot Iroshizuku Kiri-same. I must be quirky, because this quiet gray is my favorite Pilot Iroshizuku ink. Kiri-same is the warmer twin of Fuyu-syogun. Not very saturated, but legible even from an extra-fine nib, Kiri-same is like a liquid pencil.
An everyday ink? Probably not forceful enough for most people, but I love it.