Up till now, experts use scalpels and chemical solvents to remove the varnish on old paintings. However, the process is slow and can sometimes harm the ancient painting.
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美
- 此前专家们向来都是使用小刀与化学溶液除去古画的清漆,但这个过程既耗时又缓慢,有时还会伤害到古画本身。