Thread: What is this stain and can it be removed?

Is this ammonia suitable?
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and this peroxide?
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Can you please go through it with me? So Ill have a cup of ammonia and a cup of peroxide both at 100% strength. Then have 2 cups of water where I can slowly add ammonia and peroxide into each to slowly increase concentration. Do I just use a small brush to apply it? I apply ammonia to the stain and then apply the peroxide over that ammonia wet patch? Then use a heat gun to dry it so it doesnt over do it?

I posted info on it a few weeks back. Read this thread and see if it helps.

Bleaching white beech timber

I'm not sure of how strong that peroxide is you linked . The stuff I use is 50%. That says 50 g/L so it may be good ?
It'll burn if it gets on you. Wear goggles and gloves.
Don't contaminate your original bottles of A or B in any way by mixing near or pouring stuff back into them. Just pour out a half a small cap full of each into a small container seal the bottles back up and take it to the job. Just try a small full strength mix on the wood first and see if it works or needs diluting . If it needs diluting add water to the peroxide.

BTW I don't think it looks like a sticker stain. When you see sticker stains you normally see them every 300 to 500 mm apart right down the boards not just one . They are normally 30 to 40 mm wide right across . Not to say you couldn't get just one but your one is sort of tapered and ends what looks half way across. If its the type of stain Ive seen before which is possibly fungal or rot of some type bleaching probably wont touch it.

My interpretation of a stain of those proportions is that when very green the board was possible stickered with or had an object stacked/stored upon it that had a steel angle or similar on edge (loading ramp, toolbox etc). If it's caused by the 'ebonizing' process, I doubt that you will have any success in minimizing its appearance.

Imho it's not from a natural process - far to linear for that.

Steel strapping may have been used to bind the pack after milling. If this piece was on the outer of the pack and part of the strap was subject to weather the result would be a stain similar to the pics.

If it was steel would oxalic acid reduce it? Cause when I tried it was like i was just scrubbing water on it. Thanks for everyone's help. Im probably not going to bother trying to stain this bleach but its a great learning exercise and its a new thing I can try in the future. This thread is great for future reference

Anyone ever try bleaching these black dots from pinhole borer? Is this the same bug that causes ambrosia maple pattern? Its a fungal thing that occurs after the borer yeah?


20230510_093456.jpg

Heres a cross section of one, I thought it looked cool. To me it looks so weird and alien that the black streaks occur perpendicular to the grain, you'd think its easier for whatever it is to grow the path of least resistance, which would be along the grain

20230510_093517.jpg

Oxalic acid is the go to for ferris stains in timber. Works better on dark rather than light timber. Sprinkle dry acid powder on stain, scrub with a toothbrush or small scrubbing brush dampened in water until a paste is formed, leave to dry usually about half hour, dust off and wipe down with warm water to remove any remaining acid. Worth a try.