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Epsom Salts browning when dehydrating - burning or normal?

  1. Mar 18, 2015 #1
    I heated epsom salts in the oven at 450F to make some make-shift desiccants and it went from white (some even clearish) crystals to solid white powder (caked together) with the edges turning a light shade of brown and a deeper brown at the 4 corners of the pan.

    Can this damage the MgSO4, is this impurities or what? Is it over-heating? Can it be left in the oven too long and damage the compound?
  2. jcsd
  3. Mar 19, 2015 #2


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    The hydrate.
    Mostly anhydrous.
    Little oven cleaner residue, soap residue, odd iron from the pan, other sources being cooked out (chromatographed) through your "column packing" in two dimensions, a layer in the pan.
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