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Forum topic by jpc posted 10-07-2009 05:03 AM 1017 views 0 times favorited 9 replies Add to Favorites Watch
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jpc

139 posts in 2649 days


10-07-2009 05:03 AM

i have noticed this in past but only on scrap wood, but today it occured on a piece of red oak in use in a current project, black dots, is this mold, if anyone out there could help me out i appreciate it in advance


9 replies so far

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upperwoodsman

40 posts in 2813 days


#1 posted 10-07-2009 05:27 AM

Sounds like mold to me or Ive finding little black dots on some of my wood looks like spider eggs. Got Pictures?

-- Scott JoBurg MI The More you know the less mistakes...........

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jpc

139 posts in 2649 days


#2 posted 10-07-2009 05:28 AM

ill get some, but seemed to happen after i wiped it with a wet rag to show a freind of mine what the color will look like when finished

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Max

55996 posts in 3741 days


#3 posted 10-07-2009 05:31 AM

The black is created from the minerals in the water reacting with the tannin in the oak. If you use any water for any reason with the oak you should use distilled water, it will not cause this reaction. That is why when you use water soluble dye they tell you to use distilled water. Or when you use water to raise the grain to sand you use distilled water.

-- Max "Desperado", Salt Lake City, UT

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jpc

139 posts in 2649 days


#4 posted 10-07-2009 05:42 AM

is the wood ruined or is there something i can do to take care of it

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Max

55996 posts in 3741 days


#5 posted 10-07-2009 05:46 AM

You can try to use a cabinet card scraper to shave off that area, if it isn’t too deep this will take it off. If it is not a piece of the project as yet you could also run it through a thickness planner if you can afford it to be thinner. I would try the scraper first.

-- Max "Desperado", Salt Lake City, UT

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jpc

139 posts in 2649 days


#6 posted 10-07-2009 05:49 AM

good then i wasnt totally off base, thats what im going to do thanks

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Max

55996 posts in 3741 days


#7 posted 10-07-2009 08:42 PM

Let us know how it turns out…

-- Max "Desperado", Salt Lake City, UT

View tbone's profile

tbone

273 posts in 3152 days


#8 posted 10-08-2009 07:34 PM

Oxalic acid works great. It’s sold at Rockler in powder form. It’s cheap. It looks like a fine salt. Mix it with water into a paste, put it on the oak and the black stain disappears pretty quickly.
As alluded to previously, it’s not mold. It’s a reaction to moisture and minerals.

By the way—you don’t want to use steel wool on oak for the same reasons—little black dots.

-- Kinky Friedman: "The first thing I'll do if I'm elected is demand a recount."

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jerryw

158 posts in 3384 days


#9 posted 10-09-2009 04:43 AM

wet steel [ pipe clamps and glue ] will cause black spots on oak.

-- jerryw-wva.

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