油墨

printing ink

oil / fat / grease / petroleum / to apply tung oil, paint or varnish / oily / greasy / glib / cunning

surname Mo / abbr. for 墨西哥[Mo4 xi1 ge1], Mexico

ink stick / China ink / CL:塊|块[kuai4] / corporal punishment consisting of tattooing characters on the victim's forehead

solder mask (applied to a circuit board)