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Very hard brown to brownish-red heartwood of a logwood tree; used in preparing a purplish red dye.
十分坚硬的洋苏木心材，棕色到红棕色，用于配制一种紫红色染料。
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Dyeing of silk fabric with natural dyes from Yunnan grass plant logwood extract
云南草植物染料的提取及对真丝织物的媒染性能
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