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Green has strong emotional correspondence with safety. Dark green is also commonly associated with money. Green has great healing power. It is the most restful color for the human eye; it can improve vision. Green suggests stability and endurance. In heraldry, green indicates growth and hope. Green, as opposed to red, means safety; it is the color of free passage in road traffic. Darker green is commonly associated with money, the financial world, banking, and Wall Street.