Look at your hair in different lighting:
* Natural sunlight: Sunlight is the best light for determining your true hair color. Look at your hair outdoors on a bright day. Black hair tends to appear very dark, almost blue-black, while dark brown hair may have a slightly reddish or brown hue.
* Artificial light: Incandescent light can make hair appear darker than it really is, while fluorescent light can make it appear lighter.
Compare your hair to a reference:
* Color charts: Look at hair color charts and compare your hair to the shades of black and dark brown.
* Photos: If you have photos of yourself in different lighting, compare them to see if you can spot any differences in your hair color.
* Other people with known hair colors: Compare your hair to people you know who have black or dark brown hair.
Consider your family history:
* Genetic factors: If you have family members with black hair, you're more likely to have black hair too.
Ask a professional:
* Hair stylist: A hair stylist can give you a professional opinion on your hair color.
Ultimately, the best way to determine your hair color is to get it professionally assessed.
Remember: Hair color is a spectrum, and there is no definitive line between black and dark brown. You may find that your hair falls somewhere in between.