The Zhang Jiugai 张九垓
Paul PengShare
Zhang Jiugai was a native of Mengshan (a historical region now part of Sichuan Province) during the reigns of Emperors Daizong and Dezong of the Tang Dynasty. His Taoist titles were "Hunlunzǐ" (Master of the Primordial Wholeness) and also "Yinju" (the Recluse).

He devoted himself to the study of Taoist outer alchemy (waidan) for more than twenty years and authored works including On Golden Stones and Spirit Sand and Essentials of the Zhuangzi.
About the Author
Paul Peng
Paul Peng is a Zhengyi Taoist priest from Longhu Mountain, Jiangxi — the ancestral home of the Celestial Masters' tradition. Ordained at 25 after a dream from the Celestial Master, he has practiced for 25 years under Master Zeng Guangliang. He is one of the curators of this store, which is officially authorized by Tianshi Fu. All items are consecrated at the temple by the resident priest team.
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