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Yakushiduo Zunma Oil turns yellow in Kaifeng.
Oxidation, improper preservation, composition change.
1. oxidation: horse oil is rich in natural oils and fats. Long-term exposure to air will lead to oxidation reaction, which will darken the color of horse oil.
2. Improper storage: Improper storage of horse oil will be affected by light, temperature, humidity and other factors, leading to its discoloration.
3. Composition change: the composition of horse oil is complex, and it will change some components for a long time, thus affecting its color.
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