The iron vitriol was used to shorten producing time and the rotten meat was for the tofu's smell.
青矾用于缩短制作时间，而腐烂的肉类则会让豆腐变得更臭。
The powdery polyphosphate ferric sulfate was prepared from iron vitriol, the byproduct in titanium pigment production by sulfuric acid process, and complex oxidant.
以硫酸法生产钛白粉的副产品——七水硫酸亚铁为原料，采用复合氧化剂合成聚合磷硫酸铁粉体，探讨了合成聚合磷硫酸铁的最佳工艺条件。
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