Fresh leaf tea contains more tannins than processed teas, according to Victor R. Preedy, author of Tea in Health and Disease Prevention.. The color of tea influences tannins, too. White tea, for example, has fewer tannins than black tea, according to the Pacific College of Oriental Medicine.annins 101. Tannins are polyphenols, compounds present in plant foods, that are responsible for the colors of many flowers and the astringent flavor of foods such as unripe fruit and tart red wine, according to Cornell University. Tannins also help proteins retain their molecular structure, Cornell University notes.
Emergency power system. An emergency power system is an independent source of electrical power that supports important electrical systems on loss of normal power supply. A standby power system may include a standby generator, batteries and other apparatus.
Emergency lighting is lighting for an emergency situation when the main power supply is cut and any normal illumination fails. The loss of mains electricity could be the result of a fire or a power cut and the normal lighting supplies fail. minimum duration of 3 hours should be used for emergency escape lighting if the premises are not evacuated immediately, as in the case of sleeping accommodation, for example, or if the premises will be reoccupied immediately the supply is restored without waiting for the batteries to be recharged.