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A preservative test in the cosmetics industry is a test to check the effectiveness of the preservative or preservative system used to preserve a particular product. In practice, this test assesses whether the preservative is sufficiently effective in preventing the growth of micro-organisms in the product, which is important for user safety. It is carried out at various stages of production and storage [...].

**Stability tests** are tests that assess the ability of a cosmetic product to maintain the original parameters of the cosmetic mass under foreseeable storage conditions. These tests involve temperature cycling, e.g. from 40°C to ambient temperature for 24 hours or from -20°C to ambient temperature. The results of these tests help manufacturers to create safe and stable [...]