Any category of strongly colored substances used to color other materials is referred to as a pigment. Because they are insoluble, pigments are applied as finely powdered solid particles dissolved in a liquid rather than as solutions. Inks for printing, polymers, and oil- and water-based paints all use the same pigments in general. Organic and inorganic pigments both exist. Most inorganic pigments are more vibrant and durable than organic ones. Petrochemicals such as coal tars and others are used to make synthetic organic colors. Inorganic pigments can be created through very straightforward chemical processes or are found in nature as on earth.