What does nine-color auspicious clouds mean?

Does the subject want to ask "what does colorful auspicious clouds mean?" Refers to the clouds that symbolize good luck. Seven colors are red, orange, yellow, green, blue and purple, and seven colors are auspicious clouds. Under suitable weather conditions, sunlight forms an appropriate angle with clouds. When sunlight passes through the clouds, the solar spectrum is separated by the refraction and reflection of ice crystals, thus scattering seven colors of light.