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.
Worldwide zones of Tropical savanna climate (Aw/As). Tropical savanna climate or tropical wet and dry climate is a type of climate that corresponds to the KÃ¶ppen climate classification categories Aw and As. Tropical savanna climates have monthly mean temperatures above 18 Â°C in every month of the year and typically a pronounced dry season, with the driest month having precipitation less than 60 mm and also less than 100 â [total annual precipitation {mm}/25] of precipitation.â1 This latter fact is in direct contrast to a tropical ...