KanjiJLPT N1
Black Ink

black ink, India ink, ink stick, Mexico

Mnemonic

Deep in the black night, a calligrapher kneels on the earth, scraping soot from charred pine roots buried in the soil. He presses the black powder into the earth-dampened stone and grinds slowly, coaxing out the richest Black Ink anyone has ever seen.
Additional thoughts
Soot (black) is literally gathered from the ground (earth) and combined to form ink sticks—this mirrors the real production process. Picture the dark night, dirty hands, and gleaming wet ink.
Quick recall
Black soot scraped from the earth becomes luxurious Black Ink.

Details

The keyword for 墨 is black ink. This kanji refers to the traditional solid ink used in East Asian calligraphy and painting, which is typically made from soot mixed with animal glue and formed into sticks. The ink stick is ground on an inkstone with water to produce a rich, dark liquid used for writing and artistic expression. By extension, the kanji can also refer to the color black or to ink in a more general sense.
On'yomi
ぼく
Kun'yomi
すみ