On Chinese dice the 4 is always red.

The word for four 四 (sì) and death 死 (sǐ) sound similar in Mandarin Chinese.

The story of the emperor who ordered the four on dice colored red.

See Tetraphobia.

The character for dice in Chinese 骰子 has the radical 骨 bone as ancient dice were made out of bone.

Types of Chinese dice.

Dice from different countries.

Book: Chinese Games with Dice and Dominoes.

Ancient Board Games at the British Museum.

See list of Chinese radicals.