Hair color numbering systems can vary between different hair dye brands, but generally, the numbers 0 to 10 represent a range of shades within a particular color family. Here's a rough guide to the colors you might expect in a typical hair dye numbering system, with a focus on natural hair colors:

1. 1 (Dark Black): An intense, dark black shade.
2. 1 (1): It seems there is a repetition here, possibly a mistake or misunderstanding. Assuming it's a typo, we can skip this entry.
3. 2 (Natural Black): A natural, medium-dark black shade, commonly found among people with Asian hair.
4. 3 (Dark Brown): A dark brown shade.
5. 4 (Brown): A medium brown shade.
6. 5 (Light Brown): A light brown shade.
7. 6 (Dark Gold): A dark, warm gold shade.
8. 7 (Gold): A medium, warm gold shade.
9. 8 (Light Gold): A light, warm gold shade.
10. 9 (Light Gold): Another entry for light gold, which may be a repetition or indicate a slightly different shade within the same category.
11. 10 (Very Light Gold): The lightest, warmest gold shade. Chromaticity is an indicator used to indicate the amount of melanin contained in the hair, and different shades of color show different shades of hair. Generally speaking, hair is divided into 10 shades, which are represented by 1 to 10 numbers. The lower the number, the higher the melanin, the darker the color, and conversely, the higher the number, the less melanin it contains, the lighter the color.

Third, the hair of Chinese is generally 1-3 degrees, the most common is 2 degrees, so the No. 2 color is also called natural black, and the color of European hair is generally 4-6 degrees.