How to identify organic pigments？- Changhong Chemical

Hello everyone! I’m a star employee at CHROMÉCLAIR, a brand of hema free gel polish brands.Today I will talk about the identification and classification of organic pigments to help you better understand organic pigments.

What are organic pigments?

Organic pigments are pigments made from colored organic compounds.

They are pigments made from organic compounds that possess color and a range of other pigmentary properties. These properties include resistance to sunlight, water immersion, acid and alkali resistance, resistance to organic solvents, heat resistance, crystal stability, dispersibility, and hiding power.

What’s the difference between organic pigments and dyes?

Organic pigments differ from dyes in that they lack affinity for the object they are dyeing. Coloring occurs only by adhering to the surface or incorporating organic pigments into the interior of an object through adhesives or film-forming substances. The intermediates, equipment, and synthesis process required for their production are similar to those used in dye production, so organic pigments are often produced within the dye industry.

Where are organic pigments used?

Compared to inorganic pigments, organic pigments generally have higher tinting strength, are easier to grind and disperse, and are less prone to settling. They also produce brighter colors. However, they tend to have lower lightfastness, heat resistance, and weather resistance. Organic pigments are commonly used to color materials such as inks, coatings, cosmetics, rubber products, plastics, stationery, and building materials.

Classification by structure:

(1) Azo pigments account for 59%

(2) Phthalocyanine pigments account for 24%

(3) Triarylmethane pigments account for 8%

(4) Special pigments account for 6%

(5) Polycyclic pigments account for 3%

How to identify organic pigments?

Organic pigments offer vibrant colors and strong tinting power. They also have low density and are non-toxic. However, some varieties are often less resistant to light, heat, solvents, and migration than inorganic pigments. While the variety of colors is endless and vibrant, there are inherent connections between them. Each color can be defined by three parameters: hue, value, and saturation. Hue is the characteristic that distinguishes one color from another. It is determined by the chromatographic composition of the light source and the perception of the wavelengths emitted by the surface of an object to the human eye. It distinguishes between red, yellow, green, blue, and violet. Value, also known as brightness, is a characteristic value that indicates the degree of lightness or darkness of an object’s surface. By comparing the value of various colors, we can distinguish between bright and dark colors.

Organic pigments encompass a variety of chemical families and cover a wide range of properties. Generally speaking, organic pigments are primarily used for applications requiring high tinting strength and vibrant hues, while inorganic pigments are primarily used for applications requiring high opacity.

We can distinguish three main categories of organic pigments: polycyclic; azo (monoazo and disazo); and metal complexes. Within each category, both general-purpose and high-performance pigments are available.

Characteristics of different organic pigment colors:

Yellow

Orange