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Oxalic Acid staining Question

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Forum topic by robscastle posted 04-23-2019 05:55 AM 428 views 0 times favorited 23 replies Add to Favorites Watch
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robscastle

6018 posts in 2566 days


04-23-2019 05:55 AM

I was making more Sungka or Mancala Boards.
The timber was some recycled cable drum sides.
It had the usual nail holes and that was not a problem as I could easly plug them up and almost disquise them.

What was more important to me was the removal of the iron nail stains.
So I mixed up some Oxalic Acid and applied it to the iron stain marks, sure enough it removed them no worries.
However I noticed the area I treated now had a pinkish tinge to it after the acid had dryed.

As I was not being sure how I could remove this I thought I would open it up to the “Brains Trust” for an opinion or a possible answer.

Here is the raw board.

Now some close up shots of some of the effected areas.

Its possible its only a surface stain and will sand out, I guess I will find out one way or the other.

I will have to remember to be a bit more skillful and contain the the area needing treatment rather than “slap” it on everywhere!

Meanwhile I have a plan to use some Swamp Gum as a contingency plan.

-- Regards Rob


23 replies so far

View LittleBlackDuck's profile

LittleBlackDuck

2509 posts in 1182 days


#1 posted 04-23-2019 06:36 AM

If you don’t get a satisfactory solution and all else fails, don’t waste those dimples… ox the whole lot and give it to a pink loving recipient!

-- If your first cut is too short... Take the second cut from the longer end... LBD

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robscastle

6018 posts in 2566 days


#2 posted 04-23-2019 07:21 AM

Good thinking there Mr LBD!

I had actually given some thought to individually dying each one a different colour!

-- Regards Rob

View Dave Polaschek's profile

Dave Polaschek

3667 posts in 944 days


#3 posted 04-23-2019 08:18 AM

I thought at first perhaps the spotted bits of color were part of some decoration. Rather than dyeing the whole board pink, perhaps you need more colors.

The internet seems to think that pink stains can be removed by sodium hydroxide, too. Perhaps that’s worth a try if you’re not looking for bold colors.

-- Dave - Minneapolis

View bilyo's profile

bilyo

659 posts in 1464 days


#4 posted 04-23-2019 02:48 PM

Apparently the application of a borax solution will neutralize the acid. Mix 2 tablespoons of borax in a quart of water and apply. Then rinse with water and let dry. That is the instruction I found. I have no experience with it. I assume the borax is available in a grocery store.

View xeddog's profile

xeddog

230 posts in 3369 days


#5 posted 04-23-2019 04:25 PM

I wonder if a watered down solution of bleach would work.

View LesB's profile

LesB

2075 posts in 3805 days


#6 posted 04-23-2019 04:40 PM

That is how we learn to try new things on a test piece first. LOL

Did you rinse the OX off after the application? I have only used it on teak on a boat but it usually it lightens the wood instead of darkening it and is neutralized by washing off. Simple baking soda should neutralize the acid if you think you need to do that. Sodium hydroxide it pretty strong so be careful if you us that.

Now you probably need to treat the whole board with the acid (and rinse) or apply some other color to cover it up.

-- Les B, Oregon

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robscastle

6018 posts in 2566 days


#7 posted 04-23-2019 10:18 PM

OK thanks guys, ... lots of ways to tackle the problem.

Dave:- Re colour/ Sodium Hydroxide

bilyo:- Borax Solution

xeddog:- Bleach Solution

LesB:- Test piece first! Rinse off/Baking Soda/Sodium hydroxide

In order of proirity this is what I am going to do
1. Simplly rinse off with plain water.
2. Bakiing Soda (borax) and water.
Then using some test pieces conduct some mad Professor test solutions using,
3. Diluted bleach.
4. Sodium hydroxide.

If all of those suggestions fail I will just sand them and see if that removes it.
Otherwise as Dave and LBD suggested Dye them.
As they are a messy and time consuming item to make I didnt want to spend too much time on each one, however looks like its a going to be necessary now.

Thank you all for your input I will respond with an update upon a satisfactory resolution.

-- Regards Rob

View Kazooman's profile

Kazooman

1310 posts in 2314 days


#8 posted 04-23-2019 10:48 PM

I am aligned with the camp that thinks it is probably a pH issue. I would try a solution of baking soda first. The borax is also a great suggestion. Reserve the lye treatment for your clogged sink drains. On the other hand, this is a piece of re-purposed cable drum. Perhaps a nice DARK stain or dye would conceal the pink color, or maybe a nice , thick coat of paint.

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robscastle

6018 posts in 2566 days


#9 posted 04-24-2019 08:24 AM

Well solution 1 failed. no difference at all, so I tried sanding, ... again a fail

-- Regards Rob

View bondogaposis's profile

bondogaposis

5368 posts in 2713 days


#10 posted 04-24-2019 02:37 PM

Sheesh, for all of the work you are putting into this, next time start with a cleaner piece of wood.

-- Bondo Gaposis

View corelz125's profile

corelz125

701 posts in 1338 days


#11 posted 04-24-2019 05:03 PM

You sure LBD wasnt there spilling some of his vino on that board?

View robscastle's profile

robscastle

6018 posts in 2566 days


#12 posted 04-24-2019 09:07 PM

Bondo, Yep agree, sometimes it dosn’t pay to use recycled timber, mind you I am happy experimenting with the activity. A plaid cutting board is next!

corelz125, Definately not any of LBDs liquid, all my own doing …and still looking for the meaning of life!! I have run out of ideas just at the moment, ...wondering if the sheep may be the best answer.

-- Regards Rob

View bilyo's profile

bilyo

659 posts in 1464 days


#13 posted 04-25-2019 01:36 AM

I don’t know what this means and It may not contribute to a solution but looking at your photos again, it appears that there is an old nail hole in the center of each stain. Is there any way to re-cut your pieces from fresh wood and avoid any nail holes?

After re-reading your post, I see that you already recognized this. Just ignore the above.

View LittleBlackDuck's profile

LittleBlackDuck

2509 posts in 1182 days


#14 posted 04-25-2019 04:30 AM

rc, you know me… always willing to provide unbiased meaningfull advice… use the peroxide to bleach your hair purple and then you can wear the pink Sunjka as ear rings… otherwise if you thing this is PHuie… listen to all those amateurs!

Why is everyone against pink?


Sheesh, for all of the work you are putting into this, next time start with a cleaner piece of wood.
- bondogapos

You’re right bondage… rc should take up O and X...


You sure LBD wasnt there spilling some of his vino on that board?
- corelz125

Not on the first pass!

-- If your first cut is too short... Take the second cut from the longer end... LBD

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robscastle

6018 posts in 2566 days


#15 posted 04-25-2019 05:57 AM

OK believe it or not I gave up on the Oxalic Acid fix.
So it was into the trenches and on with the battle.

Instead of plugging all the nail holes I bogged them up it was getting all to time consuming.
Then I sanded the surfaces profiled the edges, followed by just a tad more sanding

I found some Jarrah Stain and restained them.

Next I will apply the final finish and hopefully I am done, otherewise Ii am running up the white flag on this one and opening the Otto Bin.

-- Regards Rob

showing 1 through 15 of 23 replies

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