Why are liquid foundations packaged in glass bottles?

Why are liquid foundations packaged in glass bottles?

Most liquid foundations come in glass bottles, but bb creams can be bottled in plastic, why?
First, because the main function of the foundation is to adjust the skin tone, the glass bottle allows you to see the color inside.

Second, the glass material is safe and hygienic, and has strong corrosion resistance; the glass material has a relatively strong barrier ability, which can well block the oxidation of the foundation liquid in the bottle by oxygen, and can also prevent the liquid foundation inside from volatilizing into the air.

In addition, glass bottles can be reused many times, which can reduce costs and conform to the current environmental protection concept.

In fact, not only liquid foundation, but also many other cosmetics are also packaged in glass bottles.