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Old 04-09-2012, 04:35 PM   #1
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Mahogany deck black marks


I have a rather new mahogany porch that seems to be acquiring black marks where ever anything sits.It presently has 1 coat of tongue oil on it ( Formbys). The welcome mat, the recycle containers even a plastic shovel left a mark. How do I get rid if these before applying new tongue oil? What are they from ?

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Last edited by Tattooz; 04-09-2012 at 04:36 PM. Reason: Typo
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Old 04-09-2012, 05:45 PM   #2
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Mahogany deck black marks


Tung oil.
Could be from moisture. Is this a covered porch or exposed to rain, snow, sun?

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Old 04-09-2012, 05:56 PM   #3
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Mahogany deck black marks


It is a covered porch and just where things sit for a while it turns black. It is exposed to the elements but it cover4es a typical 100 yr old porch.Plastic snow shovel blade, plastic recycle boxes, welcome mat etc.
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Old 04-09-2012, 06:43 PM   #4
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Mahogany deck black marks


I assume this is real mahogany, not Phillippine mahogany. I found a boat building site that discussed black stains on mahogany, suggested using oxalic acid to remove them. Real mahogany is used a lot on boats, you might want to try one or more boat builder websites, especially sailboats, for ideas.
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Old 04-09-2012, 08:51 PM   #5
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Mahogany deck black marks


Thanks Daniel. I would really like to know what causes these areas where something rests on the wood.The rest of the decking is spotless.
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Old 04-10-2012, 01:20 AM   #6
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Mahogany deck black marks


Tongue oil would not have been my first choice.....I love the stuff....but not for an outside deck...tongue oil does not do well exposed to full sunlight.

Are you sure you don't have little flakes of metal on the wood? Nails?
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Old 04-10-2012, 05:57 AM   #7
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Mahogany deck black marks


No metal at all exposed. All tongue and groove. It is not exposed to much sunlight it is under a roof that gets minimal sun these marks are just manifest where something sits for a few weeks. It leaves a black outline.

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