Yellow is the color between green and orange in the spectrum of light. It is caused by light with a dominant wavelength of around 575-585 nm. It is a primary color in the subtractive color systems used in color painting or printmaking. In the RGB color model, used to create colors on television and computer screens, yellow is a secondary color made by combining red and green with equal intensity. Carotenoids give autumn leaves, corn, canaries, daffodils and lemons their characteristic yellow color, as well as egg yolks, buttercups and bananas. They absorb light energy and, in some cases, protect plants from sun damage. Sunlight has a slight yellowish tinge when the Sun is near the horizon due to atmospheric scattering of shorter wavelengths (green, blue and violet). Due to its widespread use, yellow ocher pigment was one of the first colors used in art. In the Lascaux cave in France is a 17,000-year-old painting of a yellow horse. Ocher and orpiment pigments were used to represent gold and skin color in Egyptian tombs and later in Roman villa murals. In the early Christian church, yellow was the color associated with the pope and the golden keys of the kingdom, but it was also associated with Judas Iscariot and was used to denote heretics. In the 20th century, Jews in Nazi-occupied Europe were forced to wear a yellow star. In China, bright yellow was the color of the Middle Kingdom and could only be worn by the emperor and his family; The special guests were received on a yellow carpet. According to surveys in Europe, Canada, the United States and elsewhere, yellow is the color people most commonly associate with fun, sweetness, humor, happiness and spontaneity, but also with duplicity, envy, jealousy , to greed and, in the United States, states. , gluttony , cowardice. In Iran it has connotations of pallor/sickness, but also of wisdom and connectedness. In China and many Asian countries it is considered the color of fortune, fame, harmony and wisdom.