In many cases, darker hair tends to be thicker. However, darker hair has a lower density, which means hair strands per area. Individuals with black and brown hair typically have thicker hair strands, but they have a lower frequency of hair. Whereas, blonde-haired individuals usually have thinner hair strands but a high density of hairs. 

For instance, Scandinavian people have dense hair. On the other hand, Asians have the darkest and the thickest hair, and therefore, the lowest hair density. But there are many exceptions, African Americans have black hair, but it usually has low density. Redheads are another category as they have all kinds of hair types.

If you’re trying to learn which hair type you have, you first need to find out if your strands are thick or not. You can compare the sewing threads and a strand to find out your hair type. 

If the strand is thicker than the thread, you have thick hair. You can find out the density of your hair. You should part your scalp in different places and try to examine the amount of visible scalp. The more scalp visible, the less density you have.

Is there a correlation between colour and hair type?

There are many theories on the colour affecting hair type. Scientists state that the melanin in the hair causes thickness. The more melanin, the darker the hair, the thicker the hair strand. Less melanin means lighter hair. Do not forget that in time your hair is going to change. As you get older, density decreases. This is where hair transplant methods come in. These generalizations can only help us to catch trends. They do not give us clues to identify our hair type. 

Although in some cases may show that there is a relationship between colour and thickness, there is no direct correlation between the these two. Your genetics are the key factor that affects the density and thickness. There are so many exceptions that show that there is no correlation between colour and thickness or colour and density. There is very little scientific proof behind the theory of hair density relating natural hair colour. 

Natural hair colour is a predetermined trait that humans are born with it. Therefore, they have no control over it. Based on the hair colour a person is born with, you may be more likely to have hair loss. If you are born with thicker hair, it may mask your hair loss. 

If you are born with only 90,000 hair follicles, it’s more likely for hair loss to be noticeable. On the other hand, if you have more hair follicles, your hair loss is likely to be less severe and noticeable. Natural hair colours have different textures, which means they may change to the visibility of hair loss. For instance, hair loss in dark hair may make it appear thicker than its nature, even if there are fewer hair follicles. On the other hand, blond hair loss is more visible.