Developed from the Wikipedia page on green tea.
Wuliqing tea was known in the Song dynasty period. It has been produced again since 2002 using the original processing methods by a company called Tianfang (天方). Zhan Luojiu a tea expert and professor at the Anhui Agricultural University was instrumental in developing the production methods.
Some further information can be found at http://www.topteagarden.com/chinese-tea-leaves/green-tea/wu-li-qing-mist-green/].