Final answer:
Henna is a natural hair color derived from the leaves of the Lawsonia inermis plant, used for dying hair, skin, and fabrics.
Step-by-step explanation:
An example of a natural or vegetable hair color obtained from the leaves or bark of plants is Henna. Henna is a dye prepared from the plant Lawsonia inermis, also known as the henna tree, the mignonette tree, or the Egyptian privet, and it has been used since antiquity to dye skin, hair, and fingernails, as well as fabrics including silk, wool, and leather. Other plant-based dyes include indigo, used for achieving blue tones, and anthocyanin pigments, which can be extracted from blackcurrant skin waste. These natural dyes are preferred by some over synthetic options, which often include chemicals like 1,4-diaminobenzene or 2,5-diaminotoluene as well as coupling agents and oxidants necessary for permanent hair coloring.