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Tannic Terror (Read 620 times)
 
william trench
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Tannic Terror
Feb 5th, 2018 at 9:23am
 
I was asked to turn a bowl from a client's Red Oak ( my least favorite NA hardwood !) tree with a 20" trunk. I got four out of what I gathered and this is what happened to all of them, including this 17". Even the cut-offs that were on the floor under the shavings. Both sides. All I can  think of is air-born particles form the grinder, which is 12 feet away and I stand between it and the lathe. But that just doesn't seem possible somehow. I spot-tried some Klean-Strip A+B wood bleach ( very old )  but it just turned brown and didn't remove the black. They are too deep to scrape out. My only recourse might be to 'ebonize' these bowls with my vinegar/steel wool potion.
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« Last Edit: Feb 5th, 2018 at 11:24am by william trench »  

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Tom Coghill
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Re: Tannic Terror
Reply #1 - Feb 5th, 2018 at 11:39am
 
Those appear to be in the wood before you turned them.  Those are "features".  Sorry I am no more help than that.

How long was the wood "down" before you got it?
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Ralph Fahringer
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Re: Tannic Terror
Reply #2 - Feb 5th, 2018 at 12:07pm
 
Here's somethingthst might help:

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Apparently, the tannin reacts with water to create a dark stain.... or so the site says.

You need to add a bunch more spots and make it a design concept!!! Smiley
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Paul Gilbert
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Re: Tannic Terror
Reply #3 - Feb 5th, 2018 at 12:41pm
 
this does not look like the usual "sap stain" that the hardwood lumber industry has to deal with. 

If it is a tannic acid - iron stain, then oxalic acid is the chemical of choice to remove it.  The company that I retired from sold a blend of oxalic acid and citric acid to the Oak flooring industry to remove these stains.  It worked very well for their application.
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william trench
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Re: Tannic Terror
Reply #4 - Feb 5th, 2018 at 1:50pm
 
They are definitely iron stains and did not show up until the next day. I'll give the Oxalic a try. I know my bottles of A+B wood bleach are ancient. If all fails, I actually think black oak grain looks cool. I 'ebonized' a couple of Cherry bowls that looked great.
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Ed Weber
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Re: Tannic Terror
Reply #5 - Feb 5th, 2018 at 2:42pm
 
Paul Gilbert wrote on Feb 5th, 2018 at 12:41pm:
The company that I retired from sold a blend of oxalic acid and citric acid to the Oak flooring industry to remove these stains.

Most home recipes for dealing with this contain lemon juice, inexpensive and apparently effective.
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robo_hippy
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Re: Tannic Terror
Reply #6 - Feb 6th, 2018 at 11:12am
 
I keep a bottle of concentrated lemon juice by my lathe when turning. If the wood is still wet, most of the time it only takes a minute or so. If it has been on for days, or the wood dries first, then it may take repeated applications, and at that point the lemon juice can bleach sections of the wood. I always tap my tool off after sharpening, and also wipe the shafts off with a clean rag or some times just the shavings.

robo hippy
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william trench
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Re: Tannic Terror
Reply #7 - Feb 15th, 2018 at 10:05am
 
Success !! Oxalic acid followed by Borax followed by liberal water wash and beautiful ! Still don't like red oak very much....
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Ralph Fahringer
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Re: Tannic Terror
Reply #8 - Feb 15th, 2018 at 11:25am
 
I kept thinking that i knew Oxalic acid from somewhere...

I just remembered...

Years ago, i went down to Arkansas to dig for quartz crystals and the soil is a iron red clay type stuff and it stains the crystals so we put them into a solution of oxalic acid in a crock pot and heat it up and then cool it back down to normal temps and they are clean as a whistle!! Smiley

If they come out of the cooker while hot, they wil crack apart....they will actually crack right out of the ground if not wrapped to keep them cool.

Been years since I was able to kneel on the ground for quartz crystals! Ahhh, youth!! Roll Eyes

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Arlin Eastman
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Re: Tannic Terror
Reply #9 - Feb 16th, 2018 at 6:46pm
 
robo_hippy wrote on Feb 6th, 2018 at 11:12am:
I keep a bottle of concentrated lemon juice by my lathe when turning. If the wood is still wet, most of the time it only takes a minute or so. If it has been on for days, or the wood dries first, then it may take repeated applications, and at that point the lemon juice can bleach sections of the wood. I always tap my tool off after sharpening, and also wipe the shafts off with a clean rag or some times just the shavings.

robo hippy

Paul Gilbert wrote on Feb 5th, 2018 at 12:41pm:
this does not look like the usual "sap stain" that the hardwood lumber industry has to deal with. 

If it is a tannic acid - iron stain, then oxalic acid is the chemical of choice to remove it.  The company that I retired from sold a blend of oxalic acid and citric acid to the Oak flooring industry to remove these stains.  It worked very well for their application.


Like both of them said

I also use Lemon juice to take it off.  Sometimes if a chuck is used to hold it then it will turn dark and I remove it like what was mentioned.
Also like someone said turn it all black and go with it which is called ebonizing the wood.
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