brownish black

Causes of brown or black spots in brass barrel plating of small hardware were analyzed and some counter measures were put forward.

　分析了小五金产品滚镀黄铜层易产生棕黑斑点的原因,论述了黄铜层出现棕黑斑点是零件基材腐蚀的开始。

Mammalian coat color is induced by switching between eumelanin and phaeomelanin, which are produced by melanocytes in hair follicles.

哺乳动物毛色的形成是由毛囊黑色素细胞产生的真黑素和棕黑素之间的转换而引起的 ,控制哺乳动物毛色的基因位点很多 ,且以错综复杂的方式互相作用。

Preliminary Observations on Ecology of Elaphe schrenckii(Strauch);

棕黑锦蛇Elaphe schrenckii(Strauch)生态初步观察

The optimum extraction conditions and production rate of Cinnmonum camphora dark red pigment were established with orthogonal test L_9(3~4)and Duncan method.

利用正交试验设计和Duncan法检验,确立了樟树叶棕黑色色素的最佳提取条件及其提取率。

The dark red pigment isolated from dry leaves of Cinnamomum camphora has high stability in the solutions with pH 4.

从樟树落叶中提取得到的棕黑色色素在ｐＨ４。