Chinese recipe for Earth Yellow, Dihuang, 地黄. Qimin Yaoshu, 5th century, Jia Sixie, Beijing, 1998, pp. 379-81
Rehmania glutinosa must first be ground in a mortar. It takes at least half an hour of grinding to make the proper particle size.
Heat the crushed substance with fresh water and let it simmer.
You must add some ashes from artemisia or from the fireplace to the solution.
In this case slips of Shanghai silk are used for dyeing. Testing various time periods in the solution to get the best results.
other dye test slips from Sumu and Zicao
Sumu, 苏木, mixed with alum from a chinese shop in Beijing.
Zicao, 此草, mixed with alcohol 90%
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