虹

1. Origins, structure, and basic meaning

• Structure: 虹 is read as にじ and is a noun for a rainbow, a band of multiple colors seen in the sky, often after rain.
• Basic usage: Seeing a rainbow after the rain appears in 雨上がりに虹が見える, while coloring a rainbow in seven colors appears in 虹を七色に塗る.

2. Common pitfalls and similar expressions

• Visible subject and colored object
  • Use 虹が見える when a rainbow is visible and 虹を塗る when coloring a rainbow in a picture.