>>57200542>Is there a reason why some artists sketch in blue?Tradition carried over from traditional art. Light colors are easier to erase (also why some sketch in red), and/or they use a color that wouldn't show up when the page is scanned.
Digitally there's not exactly a benefit aside from differentiating the sketch lines from the lineart, but it's not super necessary given you can freely change layer opacity, so any color will do.
