Re: [Histonet] Question about molecular sieves for EtOh

From:Rene J Buesa

  If you want to have really anhydrous EtOH, why don't you just add an excess of anhydrous copper sulfate (white powder) that will absorb any water in the EtOH?
  I used this method for years and changed the powder when it began to turn blue.
  Copper sulfate anh. will not only dehydrate the EtOH but will indicate you also when to change it and probably will be cheaper that your present method.
  Hope this will help you!
  René J.

Lawrence D Lanberg/O/VCU  wrote:
Dear Histonet Community,

Today I added 3A bead molecular sieves to my EtOh, so I can have
(hopefully) a better tissue dehydration tomorrow. But the ethanol took on
quite a murky appearance. It seemed that after a few hours it cleared, just
a tiny bit. But it still looks kind of scary.

Does this go away completely -- with longer sitting of the ethanol??? Or
does anybody know a good way to separate, without the chance of humidity
getting back into the EtOh?

Thanks so much.

Larry Lanberg

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