While permanent color is just that â permanent â it does tend to eventually fade with time. Hello, oxymoron. However, it's the only type product that can actually lift pre-existing color out of the hair, since it relies on hydrogen peroxide and ammonia to get the job done. It's also the only type of hair color that can cover gray completely, and it also has the ability to change the hair up to four levels â sometimes even five. After combining the tint of choice with a developer, the permanent hair dye is applied, and the ammonia immediately begins opening up the cuticle. Then, the peroxide moves in, breaking up the melanin in your hair shaft, replacing what's left with the pigment of your choice (hopefully).
tropical zone. n the part of the Earth's surface between the Tropic of Cancer and the Tropic of Capricorn; characterized by a hot climate. any of the geographical zones loosely divided according to prevailing climate and latitude.
The Subtropical Zone This zone refers to the areas that are just outside of the formal Tropical Zones. It is hot, but not quite as hot and humid as Tropical areas. Winters are mild to cool, but not cold enough for snow or frost.