A compatibility test consists in checking the interaction of the pair: a cosmetic product/its packaging in environmental conditions that affect it in order to check their conformity. If the result of the test is positive during the research stage, a decision can be made for the product to be manufactured. The packaging is to be compatible with the product that it contains – it means that all components of a particular cosmetic product do not have an adverse effect on its packaging and vice versa – the components of the packaging do not interact with the product. What is crucial in the choice of the right packaging is the knowledge of the components of the formula, since there are certain rules saying that some raw materials interact with certain sorts of packaging in an undesirable way.