One kind of brown coloring matter has been extracted from skin of Quercus acutissima seed and it has good light resistance, heat resistance and anti oxidative ability.
从橡子皮中提取得到了一种棕色色素，该色素具有良好的耐光、耐热和抗氧化性能。
Freshly blown pulp turns a reddish brown when exposed to air, on account of oxidation of lignin and coloring matter remaining in the pulp.
刚喷放暴露在空气中的浆料会变成微红色，这是由于浆料中残留的木素和有色物质被氧化的原因。
Freshly blown pulp turns a reddish brown when exposed to air, on account of oxidation of lignin and coloring matter remaining in the pulp.
刚喷放暴露在空气中的浆料会变成微红色，这是由于浆料中残留的木素和有色物质被氧化的原因。
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