粉

1. Origins, structure, and basic meaning

• Structure: 粉 is read こな here and means powder made of fine particles.
• Basic usage: It describes food ingredients made into powder or powder being spilled.

2. Common pitfalls and similar expressions

• Do not assume the material
  • 粉 alone does not necessarily mean wheat flour. 豆の粉 separately identifies the material as beans.
• に for the result
  • In 豆を粉にする, を marks what is changed and に marks the resulting powder.