white is associated with light, goodness, innocence, and purity. it is considered to be the color of perfection, it means safety, purity and cleanliness. As opposed to black, white usually has a positive connotation
Green is the color of nature. It symbolizes growth, harmony, freshness, and fertility. Green, as opposed to red, means safety; it is the color of free passage in rode traffic. Use it to indicate safety when advertising drugs and medical products.