expression
diametric opposites; night and day; black and white
Idiomatic expression literally meaning 'snow and ink', used to describe two things that are completely different or opposite in nature.
彼と彼女の性格は雪と墨ほど違う。
Their personalities are as different as night and day.
この二つの意見は雪と墨だ。
These two opinions are diametric opposites.
The expression derives from the stark contrast between white snow and black ink, symbolizing complete opposites.