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Blue Mantle
blue moon
Blue Mountains
blue murder
Blue Nile
blue note
blue on blue
blue pages
blue-pencil
Blue Peter
blue-plate
blue point
blue racer
blue riband
blue ribbon
blue-ribbon jury
Blue Ridge
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blue vitriol

blue vit·ri·ol


noun 
Definition:
 
chemistry  ( archaic )
Same as  copper sulfate


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