Because the essence of jadeite is a natural mineral rock composed of jadeite (namely sodium aluminosilicate) and a small amount of other associated minerals, its mineral elements were formed in a long geological evolution history, and the composition and distribution of these mineral elements determine the color of jadeite. If a piece of jade itself is not dark green, unless it is artificially dyed with chemicals, it is impossible to fundamentally and significantly turn dark green because of artificial physical wear.
If some jadeites have dark green, and the area of dark green increases after wearing for a long time, then the possible situation is:
These dark green jadeites are artificially dyed, which is often called C jadeite. After wearing for a long time, artificially dyed chemical dyes may spread and corrode to a wider range, leading to an increase in dark green. In this case, Jade can't issue the A goods inspection certificate. Generally, the test results will show "Jade (dyed)" or "Jade (artificially optimized)", and the dark green looks unnatural. If you zoom in, you will find that the color is enriched in the cracks of jadeite.
The surface of this jadeite was once coated with colored polishing powder. After waxing and coating, it covered a lot of dark green, showing a light green or sunny green. As a result, after wearing it for a period of time, the coating, waxing and color polishing powder disappeared, and the original color was changed. In this case, jadeite can issue a cargo certificate, and some certificates will be marked with the words "see the residue of colored polishing powder", which can only be seen by self-identification;
In fact, the color of this jade has not changed, but people's memory of the image is vague, resulting in the illusion of deja vu color change, or observing under different light backgrounds, we will find that the color of jade has different performances, which is a normal optical effect. Just like optimizing a picture with image processing software, changing the parameters such as light intensity and contrast will obviously change the color of the picture. This situation can be clearly observed and compared repeatedly under different light backgrounds, and photos can be taken to record the comparison;
There is a theory that sweat and oil stains of human body will penetrate into jadeite from the microcracks of rough jadeite, and react with some mineral elements, and flow inside jadeite together with some chromogenic elements. This is the most common theoretical description of jadeite "feeding", but some experts object to this theory, so it is not clear whether this really exists.
In short, it is difficult to change the color of pure natural jadeite products without artificial chemical treatment, but it is still possible to change this color under special circumstances, and the specific situation needs careful analysis to be clear.