Pvc Wallpaper

Grade A significant difference --- allowed; there are differences qualified --- allows, but does not affect use. Domestic manufacturers in addition to individual manufacturers, basically executed as a standard product. From a scientific point of view, there is no color products can not be produced, only a theoretical existence. Because the color of the wallpaper is not like paint or coating, monochrome configuration, and wallpaper are basically made by the multi-color printing and spot color printing are, and each printing pattern showed only a part of the final product or the entire area is in bits and pieces. Not like paint or paint color difference meter can be used to measure its color value δE, it can be represented by the data. Chromatic aberration is absolute, it does not recognize its existence is pseudo-science, but must be within the approved range. Varying degrees of recognition, the result is also different. There is a story, a woman returned from the United States, selected a home-made wallpaper, after posting a good home, I can not see color, but the lady was a replacement, I can not see a reason how can a condition called wallpaper web, while a Chinese woman to buy a imported products, also require replacement, color serious grounds that the products can not let her satisfaction, and after comparison salesman color almost nonexistent. Test conditions in the color of the standard QB / T 3805-1999 is described: Test appearance when the quality of the sample, in well-lit conditions (sunny weather north window of daylight) visually, using standard light box, if necessary . 
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