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Topic: what gives tannic acid its colour?  (Read 3778 times)

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Offline Peter57

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what gives tannic acid its colour?
« on: July 11, 2013, 04:44:36 PM »
what gives tannic acid its colour? is it possible to remove the colour by mixing it as a solution and distilling?

Offline Arkcon

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Re: what gives tannic acid its colour?
« Reply #1 on: July 11, 2013, 04:56:34 PM »
Tannic acid is available as a reasonably pure substance.  Its brown.  You can't purify away any impurities and change its color.  Mixing a solution won't purify it or change its color.  Distilling a powdered organic compound isn't possible.  And mixing, then distilling is also a process that doesn't purify anything.
Hey, I'm not judging.  I just like to shoot straight.  I'm a man of science.

Offline Peter57

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Re: what gives tannic acid its colour?
« Reply #2 on: July 11, 2013, 05:10:34 PM »
Ok, thanks,

is it possible to synthesise low molecular weight tannic acid from the raw stuff?

Offline arthur1972

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Re: what gives tannic acid its colour?
« Reply #3 on: May 13, 2017, 10:57:08 AM »
what gives tannic acid its colour? is it possible to remove the colour by mixing it as a solution and distilling?

I also bought 5 drums tannic acid from one China tannic acid factory http://www.tnjchem.com/buy-tannic-acid-tannin-from-china-suppliers-at-best-price_p2327.html and found the same problem. Their explanation is that tannic acid is easy to absorb moisture, easy to oxidize in the air, and the color deepens after oxidation. I checked some  books and says the same.

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