五彩

The 'five colors' of traditional Chinese aesthetics are 白 (white), 黑 (black), 红 (red), 黄 (yellow), 青 (blue/green) — corresponding to the Five Elements (五行 wǔxíng): metal, water, fire, earth, wood. In modern Chinese 五彩 just means 'brilliantly colorful', not literally five hues.

usage

Most often appears in set phrases: 五彩缤纷 (wǔcǎi bīnfēn, 'a riot of color'), 五彩斑斓 (wǔcǎi bānlán, 'gorgeously variegated'). Modifies things like rainbows, flowers, lanterns, fireworks.