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Blue Stain (Read 298 times)
 
Rick Caron
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Blue Stain
May 13th, 2017 at 9:43am
 
Some people call that Bluish/Grayish color in some wood "blue stain" .  Is this just the first phase of rot?      
What's the difference between spalted and ambrosia? Looks the same to me.      Smiley
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Ralph Fahringer
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Re: Blue Stain
Reply #1 - May 13th, 2017 at 12:09pm
 
Spalting is from the fungus in the ground created in the process of the wood rotting.

Ambrosia is from the Ambrosia bug and is created by the bug as it travels thu the wood.

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Re: Blue Stain
Reply #2 - May 13th, 2017 at 1:05pm
 
Some "staining" comes from the soil.
Certain mineral deposits in the soil will color the wood in a variety of colors. Typically this type of staining does not weaken or decay the wood, only discolor it.
A photo would help determine the cause of your discoloration.
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Don Stephan
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Re: Blue Stain
Reply #3 - May 14th, 2017 at 10:16am
 
Dr. Seri or Sara Robinson (with others) has a very through book on spalted wood.

My understanding from reading the book a couple times is that spalting is a color change caused by fungus. One of the most common examples is black or brown zone lines, orange, red, blue, and other colors are also possible. Some "white rot" fungi will even bleach the color of dark wood in early stage activity, before turning the wood punky.

Fungus can be introduced in dead wood from contact with the ground, but can be airborne from spores or even introduced by people wanting to make spalted wood.

Wikipedia says the ambrosia beetle and ambrosia fungus live in a symbiotic relationship - the beetle makes tunnels so the fungus can migrate through the wood and the beetle eats the fungus.

An on-line article from Michigan State University extension service says the female ambrosia beetle tunnel into a tree and innoculate the wood with the ambrosia fungus she carries in sacs in her body. She lives on the growing fungus and eventually lays eggs there.
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« Last Edit: May 14th, 2017 at 10:17am by Don Stephan »  
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Ken Vaughan
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Re: Blue Stain
Reply #4 - May 14th, 2017 at 10:50am
 
It also depends on the species. Pine bark beetle carries a staining fungi that causes "blue" or grey staining in pine. It used to be considered a defect, but now seems to be normal in construction pine at the local lumber vendors.

Local balsam popular (also called cottonwood) rapidly stains to the blue-grey color if not dried quickly. The stain is very uniform through the wood quickly.

While ambrosia beetle stained maple wood is frequently sold to turners, it will take up residence in logs of other species and reduces the value of the wood to sawmills significantly. Widely distributed critters.

So the answers will vary depending on where you live and the season. Different fungi eat different things in the wood in different species.





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« Last Edit: May 14th, 2017 at 10:56am by Ken Vaughan »  
 
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Re: Blue Stain
Reply #5 - May 14th, 2017 at 6:38pm
 
Rick Caron wrote on May 13th, 2017 at 9:43am:
Some people call that Bluish/Grayish color in some wood "blue stain" .  Is this just the first phase of rot?      
What's the difference between spalted and ambrosia? Looks the same to me.      Smiley


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