落款

1. Origins, structure, and basic meaning

• Structure: 落款, read らっかん, is an artist's seal or signature mark placed on calligraphy or painting.
• Basic usage: 落款を押す describes stamping the work; 落款から作者を確かめる uses the existing seal to identify the artist.

2. Common pitfalls and similar expressions

• Applying a seal and reading it as evidence
  • With を押す the seal is being added; with から it is already present and serves as the source of identification.