What if there is color difference in stone marble and tiles? What is the national standard for the color difference of white marble slab? Whether it is house decoration or paving roads, it is inseparable from white and gray marble. Some industries do not require high color, so the color difference of the stone is irrelevant. Then, for decorative stone, the color difference needs to be strictly controlled. This article introduces the stone color difference detection method and solution.
How to detect the color of stone?
Stone color difference is a very normal and very common thing. We live in a colorful world, and even if objects that look very similar in color, the colors are subtly different. The detection of the chromaticity index of these colored objects is an important means of quality control, so the color of the stone is also required to measure the color difference. See if the predetermined indicators are met to meet the actual needs.
There are two methods for detecting the color difference of the stone by using the instrument. One is the spectrophotometric color measurement method, and the other is the direct reading method of the stimulus value. Among them, the spectrophotometric colorimetric method is measured by a spectrophotometer, and the corresponding data of monochromatic light and transmittance or reflectance is obtained, and the tristimulus value and the chromaticity coordinate value can be obtained according to the formula. The direct reading method of the stimulus value is measured by a photoelectric integration instrument using a photoelectric integral element. For manufacturers with higher color requirements, it is recommended to use a spectrophotometric colorimeter (spectrophotometer) for detection.
Stone color difference processing method:
The color difference of the stone is unavoidable, but we can reduce the chromatic aberration as much as possible. At present, the treatment methods for stone color difference mainly include dyeing, retouching, and adding light.
According to the structure and color characteristics of the stone, we can attribute the stone color difference to the same color stone and different color stone. For the same color of stone, the difference in color is usually small, so the color difference curing agent can be used to adjust the small color difference between the stones. For example, dark-colored stone with respiratory micropores such as marble, granite, sandstone, slate, etc., which have worn, faded, dimmed, etc., can be used for color enhancement. However, the effect of light stone is not obvious.
Stones of different color systems have large differences in color, and it is difficult to handle chromatic aberration using the color enhancement method. This is something that needs to be solved by using the dyeing method. Dyeing method can also be called coloring method, a color difference processing method commonly used in the industry. The surface of the stone is colored by a professional stone stain. However, since the stone is difficult to be dyed once it is dyed, it is necessary to ensure the quasi-determination of the color difference measurement before coloring, and the coloring agent color difference can be adjusted by a professional coloring software to perform construction, so as to avoid unnecessary loss.
After a long period of use, the surface of the stone is prone to water spots, white rust, rust spots, weathering, etc., and the resulting surface color difference is mainly solved by the clear method of stone.
The clear stone is the pollution that removes the decorative stone, and the stone restores the original color, luster, texture and texture. It is not effective for any chromatic aberration caused by pollution, but it is the most convenient and easy to use method.
Stone color standard national requirements:
For natural stone, its appearance property is also the main basis for our selection of stone. Generally, the demon is checked for parameters such as surface finish, appearance quality, and size. If the stone board used has obvious color difference, and there are defects such as dark spots and cracks, it will not only affect the look and feel effect of the stone, but also the slate will be leaking and peeling after a long period of sunshine, freezing and weathering, leaving no small Security risks.
According to the "GB/T 19766-2005 natural marble building panels" standard:
The color tone of the same batch of plates should be basically adjusted, and the patterns should be basically the same.
The detection method is that the protocol board and the inspected board are placed side by side on the ground, and stand at 1.5 m from the board for visual inspection.
Of course, for different industries, the standard for stone color difference is also different. For detailed national requirements for stone color difference standards, you can refer to the color detection regulations of various industries.
