Why are the plugs at one and four o'clock red?

Dice is one of the indispensable tools for many entertainment activities, such as mahjong. Dice here refers to gambling that depends solely on dice to decide whether to win or lose. According to legend, the inventor of dice was a writer in the Three Kingdoms period. Originally used as a divination tool, it later evolved into a game of concubines in the harem, in which dice points were used to bet on wine or silk sachets. At that time, the dots on the dice were all painted black, and it was not until the Tang Dynasty that red strokes were added. But in archaeology, the earliest dice appeared in Egypt.

Legend has it that Emperor Xuanzong of the Tang Dynasty and Yang Guifei were throwing dice in the harem and were about to lose. Only four o'clock can save the defeat. One of them was still spinning like this, and Emperor Xuanzong of Tang Dynasty was so anxious that he even shouted "4! 4! "It is 4 o'clock after the dust settles. As soon as Emperor Xuanzong of the Tang Dynasty was happy, he asked Gao Lishi to announce that red can be painted on the dice, but red can't be used indiscriminately. Later, 1 was painted red for 4.