Some jade enthusiasts notice that Hetian jade pieces gradually yellow with prolonged wear. In reality, the color of white Hetian jade typically doesn’t undergo significant changes. Genuine jade possesses stable properties, and normal wearing or handling usually doesn’t cause noticeable alterations. Any variations in shade are related to the jade’s quality, duration of wear, and maintenance practices.
Several factors contribute to Hetian white jade yellowing over time. First, consider the jade itself: some varieties have a porous texture prone to yellowing or darkening. For instance, Russian-sourced Hetian jade often exhibits this trait due to its coarse structure. Prolonged handling and wearing will gradually cause it to yellow. Therefore, when selecting jade, opt for Xinjiang Hetian seed jade, which is relatively stable and less susceptible to environmental influences.
Improper daily care of Hetian jade is another key factor, primarily involving the following points:
1. Individuals possess sweat with varying degrees of weak acidity or alkalinity, which can corrode mineral substances. Prolonged close contact and handling inevitably affects the jade’s appearance to some extent. Regular cleaning and maintenance of Hetian jade is recommended.
2. Wearing high-purity white jade can cause yellowing due to sweat absorption, diminishing its aesthetic appeal and value. Therefore, pay attention to cleaning white jade and maintain a consistent cleaning schedule.
3. Protect white jade from contact with acidic or alkaline substances. These chemicals can corrode the surface, leaving marks that reduce both beauty and value.
4. Avoid exposing jade to high temperatures or direct sunlight. Prolonged exposure to heat or intense sunlight causes jade to lose moisture, fade in color, and develop cracks, diminishing its value. Keep jade away from heat sources like stoves.
Regarding oxidation in jade: Hetian jade contains varying amounts of iron. When exposed to air, these iron ions undergo oxidation, forming iron oxide. This oxidation process causes the jade to develop a yellowish hue characteristic of iron oxide. Mountain-mined Hetian jade is particularly prone to rapid oxidation because it only begins to interact with air after being cut and polished post-extraction.