CLP (Classification, Labelling & Packaging) is the safety system used across the UK and EU to ensure that any product containing hazardous substances—such as fragrance oils used in wax melts, diffusers, and candles—is clearly labelled with the correct warnings, pictograms, allergen information, and safe‑use guidance. It helps protect customers by making sure every product displays accurate hazard details based on the ingredients used, so the item can be handled, stored, and used safely.