Porcelain replaced silk as China's chief export in the 11th century, as India and Persia began to develop their own domestic silk production; meanwhile, however, China obtained new techniques in sugar refining and cotton production from India, marking the beginning of the development of these industries in China. In the 12th century, Chinese merchants first began in significant number to venture overseas themselves; most devoted their attentions to the so-called Spice Islands in and around the Moluccas and Indonesia, where rare (and therefore valuable) spices such as cloves and nutmeg could be found.<ref name=crossroads393/> | Porcelain replaced silk as China's chief export in the 11th century, as India and Persia began to develop their own domestic silk production; meanwhile, however, China obtained new techniques in sugar refining and cotton production from India, marking the beginning of the development of these industries in China. In the 12th century, Chinese merchants first began in significant number to venture overseas themselves; most devoted their attentions to the so-called Spice Islands in and around the Moluccas and Indonesia, where rare (and therefore valuable) spices such as cloves and nutmeg could be found.<ref name=crossroads393/> |