ba̍k-tsiak墨跡

ink marks

ink marks; ink stains; original handwriting, calligraphy or painting (especially of a famous person)

English Wiktionary, “墨跡” (CC BY-SA 4.0) — https://en.wiktionary.org/wiki/%E5%A2%A8%E8%B7%A1 · confidence: Medium (Wiktionary, Hokkien)