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1. The characteristics of natural organic pigments
Organic pigments are generally derived from plants and marine animals, such as indigo, garcinia, and ancient Roman purples extracted from shellfish. Organic pigments are bright in color and strong in tinting strength; low in density and non-toxic. Organic pigments look more frothy, while inorganic pigments are heavier. Organic pigments generally have higher brightness and higher tinting strength than inorganic pigments.

2. The tinting strength of organic pigments wiki
The tinting strength of organic pigments is mainly determined by their molecular chemical structure. Certain monoazo pigments, disazo pigments, phthalocyanine pigments, and heterocyclic pigments not only have bright colors but also give high tinting strength. For a specific chemical structure pigment, its particle size and distribution directly affect its tinting strength. The decrease in the average particle size of the pigment can lead to an increase in its tinting strength, that is, the tinting strength largely depends on the dispersion level of the pigment; coloring The intensity is not only dependent on the particle size, but also on the shape of the particles. Generally, flaky or slender particles can absorb light better and show a higher molar extinction coefficient. Aggregate particles, which are not conducive to the absorption of light.

3. Three primary colors of synthetic organic pigments
Organic pigments have bright colors and strong tinting strength; low density and non-toxicity, but some varieties are often inferior to inorganic pigments in light resistance, heat resistance, solvent resistance and migration resistance. The variety of colors is endless and colorful, but there is a certain internal relationship between various colors. Each color can be determined by 3 parameters, namely hue, lightness and saturation. Hue is a feature that distinguishes colors from each other. It is determined by the chromatographic composition of the light source and the perception of each wavelength emitted by the surface of the object to the human eye. It can distinguish red, yellow, green, blue, purple and other characteristics. Brightness, also known as brightness, is a characteristic value that represents the change in the degree of light and dark on the surface of an object; by comparing the lightness of various colors, the color can be divided into light and dark. Saturation, also known as chroma, is a characteristic value that represents the shade of color on the surface of an object, making the color different from bright and dark. Hue, lightness, and saturation form a solid and using these three to establish a scale, we can measure color numerically. The colors in nature are ever-changing, but the most basic ones are red, yellow, and blue, which are called primary colors.

4. Ways to Improve the Coloring Strength of Organic Pigments
Usually, on the basis of the molecular structure of the selected organic pigments, the organic tinting strength can be improved through the following main ways:

1. Strive to obtain products with fine particle sizes, such as adding a dispersant or a second diazo component and a second coupling component for mixing and coupling to prepare powder pigments with excellent dispersibility.

2. The pigment paste type is prepared by squeezing water and inverting the phase to prevent the particles from agglomerating during the drying process and improve the coloring strength of the product.

3. The water or organic solvent in the water-based or solvent-based pigment filter cake is removed by freeze-drying to obtain a powder with a loose texture and excellent dispersibility. Improve the tinting strength of the product.

4.At the same time, we should try to adopt high-efficiency dispersion equipment and effective modification treatment technology in the application process, such as bead mill, high-pressure homogenizer, critical liquid carbon dioxide treatment, latent pigment treatment, laser treatment and other technologies to make the pigment The particles are further refined to improve their coloring strength.

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