Marked dominoes with invisible ink marks are widely used in domino gambling. Dominoes are originated in China from Song dynasty. Their appearances are similar with Mahjong. In China, domino is also called Pai Gow.
Like marked cards poker, we can also process dominoes with invisible ink on their back. In market, most dominoes have blank blacks. We can know nothing about their points from their backs. But if you print some marks on the backs of dominoes with invisible ink, you can know their points from these marks. Invisible ink is beyond the wave band that we can see through naked eyes. So you can see nothing strange on dominos unless you wear the other gambling cheating devices, like infrared contact lens and sunglasses.
Luminous marked dominoes are helpful when you are playing domino gambling. With the help of infrared contact lenses, you can detect the invisible ink marks on the backs of dominoes. So you can know the number of dominos in advance. If you know what your opponents hold, you can better control the gambling game you play. Double Twelve marked dominoes can greatly increase your winning odds in gambling.
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