墨汁

1. Origins, structure, and basic meaning

• Structure: In 墨汁 (ぼくじゅう), ink 墨 and liquid 汁 combine to denote liquid ink.
• Basic usage: 墨汁 is liquid ink used for brush writing.

2. Common pitfalls and similar expressions

• Liquid ink and finished writing
  • 墨汁を marks the material applied or spilled, while 墨汁が makes the ink the subject of spreading or drying; it is not the finished calligraphy.