That of iron. Iron color black, it said. Huang Ting Song, "Gu Zidun go east of the river to send" one poem: "Purple Participation should be dug paukkon, green iron Mo money but no more." Song Lu, "Dedicated to hold bowl Taoist" Poem: "Green Iron for small crown, seam Bai Zhu Short brown. "Song Su Che" Ode to Long Jiangzhou five wells ":" Jiang Bo cloud floating array, wharf green iron stand. "
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That iron Yan Qing
That green iron Yan. Tang Lu Guimeng "Purple of Feng Xi Mei to see the welcome gift to Poetry": "smell should be Fu Cheng fragile sand, blue iron Buried see also shameful."