Talk:Tannic acid

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"Tannic acid is a basic ingredient in the chemical staining of wood."

Is this a poor choice of words? Or is it really basic in wood? njh 7 July 2005 09:17 (UTC)

"It is said that soaking feet in tannic acid (or strong tea) can help prevent blisters. But the use of tea for toughening skin appears to be apocryphal, inasmuch as tea is said to be incapable of tanning leather."

I'd like to see more information on this. The reference "tea does not tan leather" doesn't seem to be a very reliable source as it does not state where the information listed originated. Isaac.tanner.madsen 07:08, 6 March 2007 (UTC)

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WARNING!!!

This article contains medical material published in 1901 - date of the publication of Dental Medicine . A Manual Of Dental Materia Medica And Therapeutics | by Ferdinand J. S. Gorgas (actually copy-pasted from a publicly available source). Given the medical advances in the last 100 years or so, this advice is obsolete and should be replaced by more up to date information.

207.112.87.166 (talk) 20:28, 8 January 2009 (UTC)

http://www.mothernature.com/Library/bookshelf/Books/47/15.cfm

Studies have shown that applying 10 percent tannic acid to vulnerable areas of the skin twice daily for two to three weeks makes the skin tough and less prone to blisters. "If you're a hard-core athlete or distance runner, you can use something like that," says Dr. Conrad. "But weekend athletes and beginners really don't have any business using tannic acid unless it's been suggested by a physician."

Jigaro Kano (talk) 20:39, 10 March 2010 (UTC)

SMILES length problem

Is there a better way to format this so the sidebar is, well, really a sidebar? Sidebar is unreadable as is (in Firefox, at least) at a reasonable window width. —Preceding unsigned comment added by 76.121.5.134 (talk) 18:59, 13 March 2010 (UTC)

pKa? 10 or 6?

" Its weak acidity (pKa around 6) is due to the numerous phenol groups in the structure. " - from the first paragraph

"Acidity (pKa) ca. 10" - from the sidebar

Which is it?!

66.189.177.23 (talk) 20:51, 25 April 2010 (UTC)

No tannic acid in tea

Phenolic content in tea states "tea does not contain tannic acid".

Based on that, I clarified the statement about this in the intro here (my addition highlight):

While 'tannic acid' is a specific type of 'tannin' (plant polyphenol), the two terms are sometimes (incorrectly) used interchangeably. The long standing misuse of the terms, and its inclusion in scholarly articles have compounded the confusion. This is particularly widespread in relation to green tea and black tea

, both of which contain tannin but not tannic acid.

Remaining problems:

• I'm not sure what the reference above to green tea vs black tea is about - needs to be clarified.
• The reference I above, which I found on Phenolic content in tea, presumably is relevant to black tea, more commonly used in Western countries in 1979. I'm further assuming it applies to all teas, but a clearer reference on this point would be good.
• This article talks about tea used for burns, and seems to imply that tea contains tannic acid - this needs to be clarified, or possibly moved. --Chriswaterguy talk 09:30, 21 March 2012 (UTC)
• it also refers to treating the after effects of wisdom tooth extraction by placing tea bags in the back of the mouth, as if tea contained tannic acid ---also incorrect. — Preceding unsigned comment added by 155.98.164.39 (talk) 07:09, 3 September 2015 (UTC)

Assessment comment

The comment(s) below were originally left at Talk:Tannic acid/Comments, and are posted here for posterity. Following several discussions in past years, these subpages are now deprecated. The comments may be irrelevant or outdated; if so, please feel free to remove this section.

I am not an expert to comment. Came here to find info. I read an article in the INternational Herald Tribune: Into the Amazon -- a journey with a bit of comfort By Larry Rohter Published: October 12, 2007 and it asserts that: The main concentration is on the Rio Negro, to the north and west of Manaus, where the tannic acid that darkens the water and gives the river its name inhibits mosquitoes from breeding, so visitors do not have to worry as much about malaria or dengue or other typical tropical maladies. It is unclear where the tannic acid comes from. Could it be from the wood in the forest?

Last edited at 15:39, 14 October 2007 (UTC). Substituted at 07:37, 30 April 2016 (UTC)

Bricks without straw

One paragraph says that a Mr Atcheson, inventor of carborundum, further discovered that gallotannic acid improves the plasticity of clay. Thus the Hebrew laborers were able to make bricks without straw because they were able to use the stubble of the plant, which contained gallotannic acid.

But his Biblical revelation is rather incomplete. Like, what plant are we talking about here? Egyptian Gallotannic Crabgrass, perhaps? And what stubble? I suppose there'd be stubble from harvested wheat, which isn't mentioned here. Is that where the gallotannic acid would come from?

My sense is that if gallotannic acid was of any great use in brick-making we'd probably still be using it. Kinsler33 (talk) 01:08, 15 September 2019 (UTC)