What is this on my woodwork? - Woodworking Talk - Woodworkers Forum
 
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post #1 of 8 Old 08-02-2020, 01:36 PM Thread Starter
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What is this on my woodwork?

Its on my oak and on my plywood which have been treated with varnish and tung oil respectively (and a bit on some oak treated with tung oil) on a project I am doing. Does anyone know what it is and if is it harmful or a potential problem?
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post #2 of 8 Old 08-02-2020, 02:29 PM
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do you have kids? do they have a sharpie around?
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post #3 of 8 Old 08-02-2020, 02:35 PM
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way more information needed to make any kind of guess.
how stored?
is this a finished project or just boards in waiting ?
any insects around that like to poop black stuff ?
wood burning stove in the vicinity ?
is it harmful ? ~ well, I wouldn't eat it.
have you tried to wipe it off with a wet cloth or mineral spirits ????

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post #4 of 8 Old 08-02-2020, 02:39 PM
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Red Oak, right? Looks like a fungus to me.

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post #5 of 8 Old 08-02-2020, 02:51 PM Thread Starter
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Quote:
Originally Posted by difalkner View Post
Red Oak, right? Looks like a fungus to me.

David
Unlikely red oak is mainly found in North America isn't it? This is a european oak.
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post #6 of 8 Old 08-02-2020, 02:58 PM Thread Starter
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Quote:
Originally Posted by John Smith_inFL View Post
way more information needed to make any kind of guess.
how stored?
is this a finished project or just boards in waiting ?
any insects around that like to poop black stuff ?
wood burning stove in the vicinity ?
is it harmful ? ~ well, I wouldn't eat it.
have you tried to wipe it off with a wet cloth or mineral spirits ????

.
As I said its finished with varnish but some of the oak and plywood is finished with tung oil and its in a campervan conversion I have just finished building. Theres a wood burning stove in my house, so I guess its in the vicinity but not the same air space and hasn't been used since march.

Just tried wiping it with a damp cloth and it cleared quite easily, totally didn't expect that. Still wouldn't mind knowing what it is though.

Last edited by EnglishElm; 08-02-2020 at 03:00 PM.
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post #7 of 8 Old 08-02-2020, 03:52 PM
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since the weather is warm, I would guess it is droppings from a bug.
here in Florida, I have seen many similar issues even in different colors.
I just wipe clean with a wet cloth and don't worry about it.
the next time I see some, I will take pictures for comparison.

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post #8 of 8 Old 08-03-2020, 11:49 AM
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I think it's frass too.

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