Ink is classified as a mixture. This is because it is composed of various substances combined together to create a specific formulation used for writing or printing. Typically, ink consists of pigments or dyes for color, solvents to keep the ink liquid, and other additives to improve performance and stability.
A pure element is made up of only one type of atom, while a compound consists of two or more different elements that are chemically bonded together. Ink, however, does not fit these definitions since it contains multiple components that may include both organic and inorganic materials. The combination of these different ingredients allows ink to achieve the desired color, consistency, and drying properties. Thus, the classification of ink as a mixture reflects its complex, multi-component nature.