Pigments In countries throughout Africa in India and in the Caribbean sweet potatoes have been shown to be a highly effective way of providing school age children and sizable amounts of their daily vitamin A. _Website not available. Sign in: https://www.twine.net/signup_…Pigments In countries throughout Africa in India and in the Caribbean sweet potatoes have been shown to be a highly effective way of providing school age children and sizable amounts of their daily vitamin A. _Website not available. Sign in: https://www.twine.net/signup_WWWW…