Color matching is an important quality control step in the zipper industry. Its main purpose is to ensure color consistency among different components and production batches, so that the final product meets appearance requirements and quality standards.
Which Factors Affect Color Judgment?
During the color matching process, the perception of color is determined by three key elements: the light source, the object being observed, and the observer. Color itself is a subjective perception, and the judgment can be influenced by many factors, such as the surrounding environment, previously seen colors, food and medication intake, genetic differences, and age. For this reason, in order to improve the accuracy of color judgment, requirements are often set for both the color matching process and the personnel involved, helping to reduce subjective deviations as much as possible.
Common Light Sources for Color Matching
In practical operations, color matching needs to be conducted under specified lighting conditions. Commonly used light sources for color matching include D65 (Artificial Daylight), TL84 (Simulated European Store Lighting), CWF (Cool White Fluorescent), UV (Ultra-Violet), and A (American-Style Window Display Spotlight Source), etc.
What Is Metamerism
During color matching, the phenomenon where two substances appear to have the same color under one light source but exhibit different under another light source is called “metamerism.” For example, the color difference between bulk samples and confirmed samples can be as high as 4 units under D65, but only 3-4 units under TL84, which is a common example of metamerism.
This occurs when two materials appear the same or very similar in color under one light source, but show noticeable differences under another. For example, the color difference between bulk samples and confirmed samples may reach 4 units under D65, while appearing only 3 to 4 units under TL84.
Because different dyes and pigments respond differently to changes in light sources, metamerism is relatively common in zipper color matching. For instance, when comparing a zipper with the provided fabric under normal office lighting, the color difference may appear more obvious. In addition, a zipper is made up of components with different materials, such as the tape, slider, and teeth, which may also show color variations under some lighting conditions. Furthermore, if the approved zipper tape color was not matched under a unified and specified light source, a noticeable difference may appear between the color card and the standard color. These situations are generally related to the metamerism phenomenon.
Based on these factors, using a unified light source during the zipper color matching process is an important prerequisite for reducing color difference risks and ensuring better overall color consistency.
