Mineral makeup is touted as all-natural and long-lasting, which can lead you to wonder how long it lasts in the jar. While it is made from materials that may last forever, mineral makeup has a limited shelf life.
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Mineral makeup is made from several natural materials as well as a few man-made ones. These include natural stones, like mica and zinc oxide, and since these materials are hardy, few mineral makeup companies bother with preservatives.
The reason any makeup goes bad is bacteria. Bacteria gets into the makeup, sometimes before it is opened, and begins to multiply. This can be exacerbated by improper hygiene when using the makeup. Cleaning yourself and your tools can prevent some bacteria growth, but it is impossible to stop completely.
Mineral makeup lasts longer than most regular makeup because it has more pigment. It also has less of the fragrances and other ingredients that cause other makeups to spoil.
The shelf life of mineral makeup is around one year. This can be extended with proper care, such as using clean brushes and keeping the container tightly closed when not in use.