Color is the visual perception of light produced by eyes, brain and our life experience. The light we see with the naked eye is generated by electromagnetic waves with a narrow wavelength range, electromagnetic waves of different wavelengths show different colors, and the identification of colors is the visual nerve sensation caused by naked eyes stimulated by electromagnetic wave radiant energy. Color has three characteristics, namely hue, lightness, and saturation. The three characteristics of color and their relationship can be explained by the color stereo in the three-dimensional space. Pigment is different from dye in that general dye can dissolve in water or solvent, while pigment is generally insoluble in water. Dyes are mainly used for dyeing textiles, but this distinction is not very clear, because some dyes may also be insoluble in water, and pigments are also used for pigment printing and stock solution coloring of textiles. The chemical structure of organic pigments is similar to that of organic dyes, so they are usually regarded as a branch of dyes. are classified from chemical composition and can be divided into two categories: inorganic pigments and organic pigments. Their sources can be divided into natural glitter and synthetic pigments. Natural pigments come from cinnabar, laterite, realgar, malachite green, heavy calcium carbonate, wollastonite, talcum powder, Mica powder, kaolin, etc, biological sources include cochineal from animals, natural fish phosphorus powder, and garcinia, alizarin red, Indigo, etc. from plants. Synthetic pigments are artificially synthesized, such as inorganic glitter such as titanium dioxide, zinc barium White, lead chrome yellow, iron blue, iron red, red lead, and organic pigments such as red powder, azo yellow, Phthalocyanine Blue, quinacridone, etc. The functions of pigments can be divided into antirust pigments, Magnetic glitter, luminescent pigments, glitter from metallic glitter manufacturers, conductive pigments, etc. Color classification is a convenient and practical method. can be divided into white, yellow, red, blue, green, brown, purple, black, etc. regardless of their source or chemical composition. The toxicology of organic pigments can be summarized as almost physiological inertia (Safe) The health impact mainly comes from their dust state (Granular substance)The pigment itself is poor due to its poor solubility. Organic pigments are actually non-biodegradable. However, dispersants, adhesives, solvents, etc. may be used in the intermediate or final products of pigments. Under certain conditions, the toxicological effects of these substances should be considered. Toxicity sometimes comes from degradation products. This degradation product of pigment occurs when irradiated by laser. For example, CI pigment red 22, produced by laser irradiation pigment cracking and toxic krebseregende 2-Methyl-5-Nitroaniline
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