File:Barium sulfate colloid from magnet solution.JPG

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English: This solution of a magnet in hydrochloric acid made a colloid when reacted with magnesium sulfate, showing that common black magnets contain minute amounts of toxic barium compounds.
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Author Chemicalinterest

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current20:05, 26 January 2011Thumbnail for version as of 20:05, 26 January 2011357 × 773 (59 KB)Chemicalinterest (talk | contribs){{Information |Description ={{en|1=This solution of a magnet in hydrochloric acid made a colloid when reacted with magnesium sulfate, showing that common black magnets contain minute amounts of toxic barium compounds.}} |Source ={{own}} |Author

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