blue vitriol

例句：

1. 1. The blue vitriol was used as a pigment in the painting.
   蓝色硫酸铜被用作这幅画的颜料。
2. 2. The blue vitriol stains easily and needs to be washed off immediately.
   蓝色硫酸铜容易染色，需要立即清洗干净。
3. 3. The blue vitriol is toxic and should not be ingested.
   蓝色硫酸铜有毒，不应摄入。