浸潤

1. Origins, structure, and basic meaning

• Structure: Written 浸潤 and read しんじゅん, it means infiltration or permeation into the interior of a material or tissue.
• Basic usage: It is used for dye spreading through cloth and lesions extending into tissue.

2. Common pitfalls and similar expressions

• Deeper than surface wetting
  • The process penetrates and spreads within rather than merely coating the outside.