求翻译：4. 此現象在壓力消除后，油漬會慢慢消失，經試驗大概5小時后，表面會恢復到原來之色水及光霧度，若需加速，可使用棉布擦拭，即可消除是什么意思？

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4. This phenomenon after the pressure elimination, the grease stains can vanish slowly, after experiments the probably for 5 hours, the surface can restore to the original allowance in former times for inferior silver content of non-standard coins and the light fog, if must accelerate, may use cotto

4. this phenomenon after pressure is removed, oil will slowly disappear, the experiment after about 5 hours, will revert to the original color of the water on the surface and the light haze, if you want to speed up, you can use a cotton cloth, you can eliminate

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