what is "alum"i need help. can some body answer me!

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what is "alum"i need help. can some body answer me!
what is "alum"
i need help. can some body answer me!

what is "alum"i need help. can some body answer me!
白矾
任何各种各样双重硫化一种三价金属譬如铝,铬,或钢 和一种金属譬如钾或钠,特别是铝钾硫化,AlK(SO4)2.12H2O,在工业上广泛用作沉淀剂、硬化剂和净化剂,医学上用作局部收敛剂和止血剂