In fact, wearing purple if you are not attending a funeral might be considered rude and unfortunate, as the hue has a spiritual, devotional significance. Purple symbolizes grief in Thailand and is designated for widows to wear when grieving the death of their husband. In China, Japan, Korea, Taiwan and Vietnam, it is customary to wear black clothing during mourning periods. In Europe, Asia and North America, purple is associated with royalty and spirituality. It is the color of majesty and of passion, of hidden violence and of eroticism. It can be found on everything from clothes to cars to buildings. The word comes from the Greek khrusos, which means "gloomy or sad." In science, technology, art and literature, purple refers to the color of blood or violet material. It is produced by mixing red and blue colors, or red, yellow and blue. When used in printing, painting and other arts, different levels of intensity for each primary color can be combined to produce many shades of purple, gray, brown, white and other colors. As a religious symbol, purple is used to represent royalty and spirituality.