基于此观测结果，科学家们推断梵高混用白与黄颜料的手法可能是造成其作品中黄颜色日渐发暗的“罪魁祸首”。

Based on this observation, the scientists speculate that van Gogh's technique of blending white and yellow paint might be the cause of the darkening of his yellow paint.

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注意手指头的颜色，如果手指疼和发麻或颜色发白或发暗，就马上来诊治。

Keep an eye on the color of the fingers. If you have pain and numbness or if the color of the fingers turns pale or dark, come right away.

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