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.

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。