Screen printing first appeared in a recognizable form in China during the Song Dynasty (960–1279 AD). Traditionally silk was used for screen-printing, hence the name silk screening. Currently, synthetic threads are commonly used in the screen printing process. Originally a profitable industrial technology, screen printing was eventually adopted by artists as an expressive and conveniently repeatable medium for duplication well before the 20th century. By the 1920's, "T-shirt" had become an official word in the American English language. In the 60's people began to tie dye and screenprint the basic cotton T-shirt. The T-shirt has entered cyberspace and is now about to become even bigger!