It made of Red acid Branch and adopting ancient Chinese abacus concept/inspiration. Red acid branch has "purple elm" named also Guangdong called "sticks." Due to the color mostly jujube, the north of the Yangtze River in China called "mahogany" or "old mahogany." Ming and Qing Dynasties in China, especially after Qianlong very popular high society respected. Acacia mainly produced in Southeast Asian countries, compact structure, texture, moist, delicate texture, can be submerged in water, because after the cut has a slightly acidic aroma so named. The color is reddish purple, darker color and easy to darken. The longer it is placed, the darker purple or even close to black, that is, it has deep color, and it will get purple when wiping with alcohol. White acid sticks with the properties of the red lotus are close, but the pigment lighter, it is not easy to become darker. capillary white sour branch smaller pores, red branch larger pores. Abacus is a simple calculation tool invented by Chinese ancestors and originated in the Northern Song Dynasty of China and was a string of beads in the Northern Song Dynasty. Today, computers are widely used. The ancient abacus not only has not been abandoned, but has been booming in many countries because of its merits and accuracy. Therefore, people often compare the invention of abacus with the four great inventions in ancient China. In the Northern Song Dynasty famous painting "The Riverside Picture of the Qingming Festival," Zhao Taisheng's medicine cabinet has drawn an abacus. Because abacus arithmetic is convenient and fast, it has been a common computing tool used by working people in ancient China for thousands of years. Even modern state-of-the-art electronic calculator can not completely replace abacus. The United Nations Educational, Scientific and Cultural Organization just passed that abacus has officially become a human intangible cultural heritage.
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