copper sulfate

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Related to blue vitriol: borax, Epsom salt

cu·pric sul·fate

(kū'prik sŭl'fāt),
A blue salt highly poisonous to algae, it is a prompt and active emetic, and is used as an irritant, astringent, and fungicide.

copper sulfate

CuSO4·5H2O; deep-blue shiny crystals or granular powder. It was used in the past as an astringent and algicide.