藍色

1. Origins, structure, and basic meaning

• Structure: 藍色 (あいいろ) is a deep blue associated with indigo dye. 藍色に変わる marks a resulting color; 藍色の糸 identifies the thread's color.
• Basic usage: The evening sky changes to deep indigo, while indigo thread serves as material for embroidery.

2. Common pitfalls and similar expressions

• Color reached by change and color belonging to material
  • Result marker に contrasts with attributive の. Here 藍色 names a color, not the indigo plant or dye substance itself.