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Discoloration in wood

Joined
Jun 29, 2020
Messages
6
Likes
2
Location
Hingham, MA
I wonder what these discolorations are and what to do to remove or minimize them, if possible.

On this piece of horse chestnut there are two types of discolorations or stains, one is greenish and the other is a muddled brown. I have seen the muddled brown on other woods that I have recently turned, including on some ambrosia maple.

AF2975C0-3B2F-4E9C-8E5C-786294634E7B.jpeg
 

john lucas

AAW Forum Expert
Joined
Apr 26, 2004
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Location
Cookeville TN USA
There are two things that work on some stains but not many. Lemon juice works on some and italic acid on some. Maybe someone else has a solution
 
Joined
May 8, 2019
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Location
Funen, Denmark
Pardon me for flashing my ignorance on chemestry and/or English, but what is "italic acid"?
Would that be oxalic + autocorrect =》 italic ?
Lemon juice may have other active components fighting stain/discolorations but I have found pure citric acid useless for this task - great for preventing staining, though.
 

hockenbery

AAW Advisor
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Apr 27, 2004
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www.hockenberywoodturning.com
Lemon juice will remove stains caused by iron. A common problem with maple and other woods. When the iron from the grinder makes black where we touch the wood.
If the dark area is a fingerprint then lemon juice would work.

2 part bleach might work.
It turns wood a lighter shade but it has no effect on black spalt lines or the red stain in box elder - makes them pop.

color is a great way to enhance a turning with less than top quality wood grain.
Milk paint is easy... add a few beads or coves and you have the opportunity to show multiple colors by cutting back the top coats to show the colors and wood underneath.
Airbrush paints offer lots of options too - they can be brushed on.
 
Joined
Aug 14, 2007
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Location
Eugene, OR
Well, looks like mold type of stains, and/or what happens when the wood starts to decompose. They go all the way through the wood. I would leave them, or totally cover them with stain or paint. Not sure if even bleaching the wood would help because you would end up with a white piece of wood. I do prefer the natural look of the wood, and those stains are natural...

robo hippy
 
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