色素的英文：
coloring matter
pigment

参考例句：

No artificial colouring ;colouring-free
不含人造色素

The coloring of food is against the law in some countries.
给食物加上色素在有些国家属违法行为。

This pigment is a good common food additive.
该色素是稳定性好的食品添加剂。

Carotenoids are major pigments of ripening Citrus fruit.
类胡萝卜素是柑橘果实呈色的主要色素。

This brand of tinned food does not contain artificial coloring.
这种品牌的罐装食品不含人造色素。

Melanoma： Dark-coloured malignant tumour of skin cells that produce the protective skin-darkening pigment melanin.
黑素瘤:一种从黑素色素皮肤细胞产生的黑色肿瘤。

The colouring pigments from the skins are not allowed to bleed into the grape juice.
外皮上的色素不能渗到葡萄汁里面去。

Colour black--Determination of blackness
GB/T7048-1993色素炭黑黑度的测定

All certified batches of suck colors must meet stringent chemical purity standards in their manufacture.
所有这些法定的色素在制造时必须符合严格的化学纯度标准。

A specialized pigment - bearing organelle in certain photosynthetic bacteria and cyanobacteria.
载色体在某些光合细菌和含氰细菌中特殊的带色素的组织

coloring是什么意思：
n. 着色剂；着色；天然色；色彩
v. color的现在分词形式

] colorful adj.
华美的；富有色彩的；有趣的

Colors are in harmony.
色彩调和。

The bottom color is the brown coffee color.
底色为棕咖啡色。

matter是什么意思：
n. 物质，事情，素材
v. 有关系

be of importance;matter
有重要性;有关系

It is no laughing matter.
这没有什么可笑的。

deposited matter
沉积物|沉淀物

pigment是什么意思：
n. 颜料；色素

red lake C pigment
色淀Ｃ颜料红

Iron oxide red pigments
GB/T1863-1989氧化铁红颜料

acquire pigment; become colored or imbued.
获得色素；变成有颜色的或染色的。