Definition
A mixture is two or more substances combined but not chemically reacted. Paint, ink, solder paste and adhesive are common examples. The components keep their own chemical identity, which is what separates a mixture from a single reacted compound.
Key point
REACH and CLP treat mixtures differently from articles. A safety data sheet covers substances and mixtures, not articles.
Because a mixture is defined by its chemistry rather than its shape, the rules around classification, labelling and supply chain information follow the chemical hazard of the blend.
Note: general educational information, not legal advice. Check the official source before relying on it.