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Zinc is a bluish-white lustrous metal. It is normally covered with a white coating on exposure to the atmosphere. Zinc dust is flammable when exposed to heat and burns with a bluish-green flame. Zinc also exists in many compounds. Zinc has a role in normal human growth, taste, and sperm development, but exposure to high levels of zinc through inhalation, ingestion, and dermal contact can cause adverse health effects. Over the next five-six years, zinc demand is likely to grow at 12-15 per cent annually, against the global market average of 5 per cent.