Cu(OH)₂, or copper(II) hydroxide, is an inorganic compound consisting of copper, oxygen, and hydrogen. It appears as a blue solid and is commonly found in nature as the mineral azurite. This compound is often used in various applications, including as a fungicide and in the production of pigments. In water, Cu(OH)₂ can dissolve to form a blue solution, which is a characteristic of copper ions. It is also a key component in the synthesis of other copper compounds and plays a role in chemical reactions involving copper.