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1. The composition of light A, light is an electromagnetic radiation and also an electromagnetic wave. The light we generally see is called visible light, with a wavelength scale between 400 and 700nm. In addition to this scale, there are rays such as ultraviolet and infrared rays. b. The composition of white light: Clean white light is composed of six colors: red, orange, yellow, green, blue, and purple, all of which constitute the spectrum. c. The composition of object color: The surface of an object contains pigments, which selectively reflect some light and also absorb other light. Pigments determine the color of the object. The color of non transparent objects is represented by the reflected light color, such as white light shining on objects containing beautiful materials, which can only reflect red light. Therefore, red color was investigated. If there are both red and yellow pigments, investigate orange. Transparent bodies are represented by the color of the light they pass through. White pigments can reflect all light, while black pigments cannot reflect any light. d. There are two types of light sources: natural light sources and artificial light sources. The spectral curve of sunlight tends to be higher at the blue end of the spectrum, so sunlight is essentially somewhat bluish. The wavelength of incandescent lamps tends to reach its peak at the red end of the spectrum, which belongs to warmer light. The curve of a fluorescent lamp emits more energy in the blue part of visible light, which belongs to colder light. After sunrise and 3 hours before sunset are good times to investigate and analyze colors.

2. Objects can be divided into two categories: luminescent and non luminescent. When a light source shines on a non luminescent object, the object reflects, transmits, and absorbs three types of reactions to the light shining on its surface, thus forming a distinct color sensation. If an object contains pigments, they selectively reflect a portion of the light and absorb other light. The reflected light determines the color of the object.

3. The visual characteristics of the investigator's eyes are the physiological basis for color perception. A person with normal color perception ability perceives the visible spectrum as a series of consecutive colors, in the order of dark red, bright red, orange, yellow, bright green, green, blue, and dark purple. People's perception of color is subjective, and people with color vision defects cannot correctly distinguish colors, making them unsuitable for color mixing work. Because women have a stronger perception of color than men, a lower probability of developing color blindness, and have meticulous characteristics, the majority of workers engaged in color matching and measurement are women.

4. The interaction between the three elements is the combination of object reflection, light source, and investigator. If any of these three factors change, the color that occurs will also change accordingly.

5. Light source discoloration: When two objects exhibit the same color under a certain light source, but when investigated under different light sources, there will be a significant color difference. The fundamental reason is that the pigments contained in objects are different, and the intensity of various colorful lights in different light sources is also different. So it is necessary to verify the color matching under the conditions of light sources that may cause color change. This phenomenon appears in color mixing, which may be due to the difference in pigments used in the repair paint and the original paint formula, resulting in different colors under different light sources. This requires the addition of color matching agents in the formula to solve the problem.

6. Standard light source and visual colorimetric standard light source: The light source agreed upon by color workers. The 'standard illumination body A' represents the light of a fully radiating body with a temperature of approximately 2856K; The 'standard illumination body B' represents direct sunlight with a relevant color temperature of approximately 4874K, equivalent to noon sunlight; The 'standard illuminant C' represents the average daytime light with a relevant color temperature of approximately 6774K; The 'standardized illumination body D65' represents a daylight phase with a relevant color temperature of approximately 6504K. Visual colorimetry is the process of arranging the colors of a sample and the colors of the sample together, and using the naked eye to investigate whether they are the same. Visual colorimetric lighting uses natural light from 3 hours after sunrise to 3 hours before sunset to prevent direct sunlight, and selects light from the northern window. The angle between the field of view and the light is 45 °, and one of the items between the field of view and the light is straight with the sample. The result of color comparison, if two color samples are completely equal in color under any light source investigation, is called the same color and same spectrum; If two samples are investigated to be of equal color under one light source and unequal color under another light source, this phenomenon is called homochromatic metamerism.

Article source: Qingyuan Automotive Repair Paint http://www.jinliangxincai.com/