所有没有着色过的天然皮肤都是奶白色的。

All skin, without coloring, would appear creamy white.

youdao

例如，二氧化钛（一种天然矿物，可用做着色剂或粘稠剂）在粘稠状混合物中是安全的，如防晒露或牙膏。

For example, titanium dioxide (a naturally occurring mineral often used as a pigment or thickener) is considered to be safe when put into a viscous mixture, such as in sunscreen or toothpaste.

youdao

栀子果实被广泛用来作为一种天然的食品着色剂，在中医临床上用于治疗黄疸型肝炎、高血压、糖尿病等症。

Gardenia fruit is widely used as a natural food colorant and as a traditional Chinese medicine for treatment of jaundice hepatitis, hypertension and diabetes.

youdao