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1·Use water to distill the Dark Brown Pigment in the differently dried walnut epicarp. We have tested the stability of the dark brown pigment.

以水为萃取剂，提取不同方法干燥的核桃外果皮中棕褐色色素，并对其稳定性进行了测试。

2·Stability testing and compare of the Hydroextracting the Dark Brown Pigment from Walnut epicarp of dry in the sun and by the airing and retting .

将同一采样点的样品分别晒干、晾干、沤干后，以水为萃取剂，提取棕褐色色素，并对其稳定性进行了测试与比较。