The proportion of biologically active components in cosmetics is several percent (and sometimes even a fraction of a percent). Therefore, opening the jar with cosmetic means, we see above all the basis, and it lies on our skin.
When mixing two immiscible media (water and oil) a very unstable system is formed. At the first opportunity, it tries to separate into its component parts.
Fragrances and preservatives - substances whose content in cosmetics is negligible - cause great concern to consumers. Therefore, in order to convince buyers of the safety of their products, some companies put a note on the cosmetics - "without perfumes" and / or "without preservatives".
Preservatives should provide protection of the cream from a wide range of organisms (bacteria, fungi) for a long time. Cosmetic products are used for several months (and even years), so the maintenance of preservatives is the storage conditions ...