Here's why:
* Melanin Production: Hair color comes from melanin, produced by cells called melanocytes in the hair follicle (located under the scalp). When melanocytes stop producing melanin, the new hair strand that grows out will be grey or white.
* Growth Process: Hair grows from the root. Therefore, the lack of melanin will be evident in the newly emerging hair.
While the ends of your hair might *appear* to be greyer due to factors like sun exposure, product buildup, or oxidation, the greying process itself always originates at the root.