On Chinese dice the 4 is always red.
The word for four 四 () and death 死 () 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.