Are you looking for organic pigments? A fundamental part of paints, printing inks and coatings is the coloring of them, and this is the product of the pigments that are added. The types of pigments can be divided into organic and inorganic, which generally appear in the form of small particles that will be used for different uses.
Organic pigments are composed of carbon compounds. In the past, they used to be of vegetable or animal origin. Some examples of synthetic organic pigments are alizarin granular lacquer, azo colors (yellow, orange and red shades), copper phthalocyanin (blue and green shades) and quinacridone (a red pigment that is resistant to light) and black of coal.
They have a greater dyeing power, (less quantity is used to provide the same intensity of color), also high performance, a greater variety of colors and comply with environmental regulations due to the absence of heavy metals in its structure and manufacture.
In general, inorganic pigments have greater resistance to thermal degradation, however, they are being subjected to numerous environmental regulations due to their heavy metal contents.
In the industry of paints and coatings, some of the most commonly used inorganic pigments are:
Titanium dioxide: it is the most used white pigment thanks to its high covering capacity, high performance and its resistance. In nature, titanium dioxide can be found in the form of rutile and anatase, which differ from having different crystalline structures.
In the paint and make-up industry, rutile is more commonly used because it does not exude to the surface, unlike anatase. In general, titanium dioxide is characterized by its excellent opacity, high yield and whiteness, chemical and thermal stability and excellent light fastness.
There are two methods of obtaining titanium dioxide, via chloride in which a product of greater whiteness and purity is obtained, and via sulphate (classical method) that is less expensive but much more polluting. After obtaining titanium dioxide, it is usually treated with aluminum, silicon and some other metals to modify and improve properties of color stability, dispersibility, opacity
Titanium dioxides are used in the production of opaque white or opaque light colors such as pastel pink, salmon, sky blue, ocher or gray, not carbon black. The opacity is given by the difference in refractive indexes between the pigment and the medium in which it is dispersed, and the greater this difference, the greater the degree of opacity.