spread to other Asian culinary spheres due to its unique concave shape and ability to sear food at a fast pace. Wrapping paper and paper envelope: The use of wrapping paper is first documented in ancient China, where paper was invented in the 2nd century BC. In the Southern Song dynasty, monetary gifts were wrapped with paper, forming an envelope known as a chih pao. The wrapped gifts were distributed by the Chinese court to government officials. In the Chinese text Thien Kung Khai Wu, Sung Ying-Hsing states that the coarsest wrapping paper is manufactured with rice straws and bamboo fiber. Although the Hall brothers Rollie and Joyce Hall, founders of Hallmark Cards, did not invent gift wrapping, their innovations led to the development of modern gift wrapping. They helped to popularize the idea of decorative gift wrapping in the 20th century, and according to Joyce Hall, "the decorative gift-wrapping business was born the day Rollie placed those French envelope linings on top of that showcase." Wrought iron: During the Han dynasty, new iron smelting processes led to the manufacture of new wrought iron implements for use in agriculture, such as the multi-tube seed drill and iron plough. In addition to accidental lumps of low-carbon wrought iron produced by excessive injected air in ancient Chinese cupola furnaces. The ancient Chinese created wrought iron by using the finery forge at least by the 2nd century BC, the earliest specimens of cast and pig iron fined into wrought iron and steel found at the early Han Dynasty (202 BC – 220 AD) site at Tieshengguo. Pigott speculates that the finery forge existed in the previous Warring States period (403–221 BC), due to the fact that there are wrought iron items from China dating to that period and there is no documented evidence of the bloomery ever being used in China. The fining process involved liquifying cast iron in a fining hearth and removing carbon from the molten cast iron through oxidation. Wagner writes that in addition to the Han Dynasty hearths believed to be fining hearths, there is also pictorial evidence of the fining hearth from a Shandong tomb mural dated 1st to 2nd century AD, as well as a hint of written evidence in the 4th century AD Daoist text Taiping Jing. X Xiangqi (See also: List of Chinese inventions#L – Liubo): The exact origins of the Chinese chess board game