...,决不使用任何对肌肤有潜在伤害成分物质,如:化学清洁剂(Detergents)、化学防腐剂(Preservatives)、化学色素(Colourants)等。
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常用的大便潜血试验的方法就是依靠化学色素转化来检测微量血液。
The commonly used stool occult blood tests rely on chemical color conversions to detect microscopic amounts of blood.
这听起来很矛盾,因为这一假设背后的理念是,树叶在秋天产生的红色素是用于保护叶绿素这种吸收光的化学物质,以免它吸收过多的光。
It sounds paradoxical, because the idea behind this hypothesis is that the red pigment is made in autumn leaves to protect chlorophyll, the light-absorbing chemical, from too much light.
他们发表在《科学》杂志上的研究成果,建立了曾经存在于古代鸟类羽毛中的色素的化学指纹图谱。
Their study, published in the journal Science, revealed the chemical fingerprint of pigments that once tinted the ancient bird's feathers.
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