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Oxalic Acid for Wood Bleaching

Even out the appearance of bare wood so it will stain to a uniform color.
Item #
78% of 100

This is one of the finest available wood bleaching agents. Use it to lighten dark streaks and colorations in wood so it will stain to a uniform color. It's also an effective rust and stain remover that works to remove many water stains, chemical stains and dirt where milder bleaching agents fail. It's not as harsh as the two-part bleaches and results in a more even color when bleaching smaller surfaces. With Oxalic Acid, wood will retain more of its original character. It comes in powder form as dry crystals and must be mixed in hot water. Use only on bare wood. 16 oz. box.

(1) Oxalic Acid for Wood Bleaching
More Information
Manufacturer Part Number P9999
Weight 1.1000
Size Pint
3.9 / 5.0
50 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Oxalic Acid
The acid took the lighter stains out of the wood on the first
application and removed the darker stains after a few
applications. It was easy to use and very effective.
December 26, 2019
7 months ago
Woodworking Experience:
oxalic acid
I had a very good experience working with the store personnel assisting me with the product even when it was out of stock on my first trip there.
September 27, 2019
9 months ago
Woodworking Experience:
Works well, no issues.
July 1, 2019
1 year ago
Woodworking Experience:
Just what I needed
Needed to lighten some driftwood that I was using for a sculpture and this oxalic acid did the job. Easy to mix and easy to use too.
January 28, 2019
1 year ago
Woodworking Experience:
Rusty nail stain removal.
Used this product to remove rust stain from rusting nails on Hardiplank. Used a slurry of water moisted powder with a small scrub brush to apply. Let rest 15 minutes and scrubbed what hadn't disappeared yet. Rinsed with water and then neutralized any residual with baking soda and rinsed again. Now I'm ready to seal and prime the nail heads for repainting.
October 12, 2018
1 year ago
Woodworking Experience:
Oxalic Acid for Wood Bleaching
this worked great. was able to get out 30 years of water and burn damage to butcher block counters.
May 16, 2018
over 2 years ago
Ok it works
Used on poplar wood, took some color out.
March 15, 2018
over 2 years ago
Woodworking Experience:
It's a looker
It made my twenty five year old unfinished red wood look like new. I'm very pleased with this product.
November 7, 2017
over 2 years ago
Best for wood bleaching, quick and non-swelling.
Removed dirty water stains from cedar planking which is to be used for table top.
October 13, 2017
over 2 years ago
Woodworking Experience:
Stain remover
Works as stated for stain removal.
September 21, 2017
over 2 years ago
Start typing your question and we'll check if it was already asked and answered. Learn More
Browse 18 questions Browse 18 questions and 79 answers
Why did you choose this?
Rockler Store
Cleaning the deck
Peter H on Jun 24, 2020
need to get some stains out
James M on Apr 15, 2020
Cleaning the deck
Peter H on Jun 24, 2020
GEORGE B on Jun 21, 2020
need to get some stains out
James M on Apr 15, 2020
Restoring a table that used to belong to my mother.
David G on Apr 14, 2020
Wood bleaching
DANA S on Mar 7, 2020
trying to take out a water stain on some tables...
BRADLEY S on Dec 9, 2019
Use to bleach wood table
Tommy B on Nov 24, 2019
Mold in mahogany door
L M on Nov 14, 2019
I read about this product after looking up tips on Pinterest and it was highly recommended
JESSICA G on Jul 26, 2019
Good for closet perfectionists like me.
Mikaol Daley on Jul 26, 2019
I'm refinishing an old oak floor and I have some dark spots that need to be corrected before I put the stain and new finish on it. My Dad used Rockler products, that's good reference for me.
Shirley S on May 8, 2019
Water stains on inside of wooden doors
Darrell Chamberlain U on Feb 22, 2019
Reviews were good, and I trust products from your company. Experienced wood workers comment and that means a lot to me. My Dad swore by your products.
Wendy T on Jan 30, 2019
I use a lot of reclaimed wood for projects and furniture. Oxalic acid is great for removing dark spots and stains, or to help unify the grain in woods like poplar. I also use it to remove stains on fiberglass decks of boats caused by mud or leaf tannin.
Richard B on Oct 21, 2018
Need oxalic acid to bleach some old wood.
Howard H on May 23, 2018
remove stains from roll top desk
Terrence O on Apr 27, 2018
Furniture restorer
Jesse S on Apr 25, 2018
The top of my desk has some big stains on it and the veneer is getting very thin. I tried some chlorine bleach on it and it worked a little. I want to try this.
B O on Mar 23, 2018
Bleaching spots from 100 year old hardwood floor.
Harland H on Feb 28, 2018
Project for wedding favors
Douglas B on Jan 29, 2018
cleaning rocks
Jo D on Sep 23, 2017
Bee bug control
Michael C on Sep 6, 2017
I've read that this can harness the green tones in poplar. I'm going to give it a try.
Emmett D on Aug 18, 2017
I need to clean some crystals that we dug out of the earth and I have been told by a gemologist to clean them with oxalic acid :-))
Chris Tee A on Jul 31, 2017
RUSSELL H on Apr 21, 2017
E Greg F on Nov 30, 2016
trying to bleach water mark, unsuccessful see first why did you buy this.
THIRINGER L on Oct 18, 2016
used on my log home and works very well
Gary L on Oct 17, 2016
I have am working on an old house that has some stains on the oak flooring and I would like to eliminate them.
Jerry C on Sep 8, 2016
To bleach crystal rocks from a quartz mine
Lula K. C on Aug 23, 2016
Having trouble with water stains on Oak table & Laundry bleach is not working.
CLIFFORD P on Jun 15, 2016
I have tried everything and was told Oxalic might get the strain out of my coffee table so thought I would give it a try!
Linda G on May 16, 2016
Have black water mark on my windowsill. Saw on internet that this could take it out.
Frank P on May 15, 2016
It was recommended as a superior method to strip my solid oak doors and enhance an even grain color before varnishing the door. The man who recommended it was very experienced. I could not find it locally.
Dollie S M on Apr 7, 2016
To bleach stains out of a used table top I bought recently on Local Sales Network.
Debra P on Feb 25, 2016
internet search regarding wood bleaching suggested this product is useful
jack p on Feb 24, 2016
Got a wood stain water-leak from roof at Lake home and trying to remove it (after making repairs)! Home interior is all cedar [4" x 3/8 planks]. Any more ideas would certainly be appreciated. MJ
MAC T on Feb 4, 2016
trying to lighten up and even out grain on Sapele
alex p on Feb 3, 2016
removing a water stain on an oak table
Mike N on Jan 26, 2016
to light wood
Mark R on Dec 13, 2015
To remove white and black rings from veneer.
GLEB L on Oct 20, 2015
To try to bleach out dark water spots/stains from hardwood floor. I've used it before on furniture (a softer wood). I'd like to try it out (to remove the dark spots) on oak before refinishing the floors.
Jose O on Oct 17, 2015
To even out color of wood
Kyle L on Aug 14, 2015
it works.
Georgena P W on Jul 16, 2015
I need to remove some black rings from a desk. I researched it online and found that oxalic acid is the product most recommended for this problem.
BARBARA G on Jul 7, 2015
The nanny state here in Canada won't let any one sell it here.
Timothy R on Jun 3, 2015
Good value compared to Woodcrafters local store
Bill C on Jun 2, 2015
I need to bleach some cabinets under sink where water has caused the wood to darken.
Gayle M on May 14, 2015
window washer recommended this product to repair stain in sill and some mold too. he said it is the best product for this window problem
John T on May 12, 2015
magazine article
malcolm A on Apr 24, 2015
GEORGE B on Jun 21, 2020
Restoring a table that used to belong to my mother.
David G on Apr 14, 2020
I thought you could use this to remove old varnish on darkened hard wood floors?
May W on Feb 18, 2017
How much do I need for a deck of 500 sq. ft.?
dave k on Jul 6, 2016
BEST ANSWER: One box should be enough even if the box says you need more. It's strong stuff that can be diluted more than recommended. That is unless you have a deck is really filthy.
Will this take out cat urine stains on an oak floor?
Tom S on Mar 7, 2019
BEST ANSWER: I don't really know. I'd suggest finding a way to test it in an inconspicuous place before going big. If you're attempting spot removal, I wouldn't recommend that, as the cleaned spots will look way different than the rest of the floor.
i want to bleach oak to look pure white. Will this work?
Timothy D on Oct 18, 2017
BEST ANSWER: Hi Timothy. No, oxalic acid is a rust remover, not an effective wood bleach. What you want is a 2-part wood bleach, such as Wood-Kote Lite-N-Up, which you can find at many paint stores, but not at Rockler. Hope this helps.
what is the dilution rate with water?
howard h on Apr 10, 2017
BEST ANSWER: I mix small batches, using 1 tablespoon per 1 cup water
Bob on Aug 4, 2015
BEST ANSWER: Robert I use this product to remove stains from antique rules. I can,t see where at 9.99 a box it would be cost effective for a whole floor. I would try diluted laundry bleach first. Patrick
My son spilled coffee on the carpet about 6 months ago and it created a black spot on our wood floor. Will this product work to get the black spot out? Thank you. BT
Bruce T on Jul 26, 2016
BEST ANSWER: Bruce, this chemical does amazingly remove water marks and stains on wood, it is very slow acting so be patient it will take several hours, overnight or may even need a second or third application, the only drawback I found is that the oxalic acid does act like a wood bleach and bleaches the spot, unfortunately the wood I was working on was natural maple, so it bleached the stain out but left the wood white and even when re-finished the area would not blend, I suspect this would work better on wood that is stained, you would need to have a matching stain and finish to touch up the repair area. Wood stain repair is more of an art than science, there is trial and error involved, unfortunately to repair a stain only requires a teaspoon or tablespoon of oxalic acid in a small amount of water, it's kind of an overkill to buy a whole box of it, I don't know why they don't sell a smaller package, if you know a woodworker or floor/cabinet refinisher ask if they may have a small amount you could use. Hope this info helps out
I have old inside doors (1919 - 1920) to strip and paint. I am getting red mahogany dye? bleeding through after stripping, priming and painting. Will oxalic acid bleach treatment after stripping prevent the pinkish bleed-through?
William L on Sep 14, 2015
BEST ANSWER: Hi...I had the same problem with the wood in my 1914 house. I spent A LOT of money on stains, acid, and wood bleaches. The oxalic did not work for me. What ended up working was a semi solid deck stain from Sherwin Williams. I used white birch. It hides the bleed thru and allows you to put another color on top. I used 2 other stains to achieve a weathered oak, restoration hardware type finish. I ended up not having to bleach or anything. I just sanded, used the white birch semi solid, let dry for a day or 2, then used my other colors. Good luck!
I started staining some cabinets with WB stain and the blotching was terrible. Will this product remove the stain so I can start over?
Tom Zarnoth on Feb 2, 2016
BEST ANSWER: I used it once with less than satisfactory results. Try this:BROWNELLS - OLD FASHIONED WHITING
Will wood bleach remove a stain from green sapwood?
Stan B on Apr 28, 2020
BEST ANSWER: Oxalic bleach can remove stains from wood but really depends on what the stain is. I have not used it myself but you can try and just put directly on the stain.
My interior wood window trim has black water marks. Will this work & how to apply?
Carla M. on Apr 7, 2018
BEST ANSWER: This product should work well for your purpose- either to remove mildew or stains from metallic hardware. First, completely remove any finish, if you have not already done so. Apply oxalic acid solution with a foam brush and use an old toothbrush to work on the stain. You may be more successful if you apply the solution and leave it for several hours. To slow evaporation, saturate paper toweling, cover it with transparent food wrap and (if possible) apply some pressure to insure intimate contact. Rinse the surface- deionized water is best. Allow the surface to dry and repeat if necessary. Take the usual precautions- keep oxalic acid away from children or pets, wear disposable gloves and use eye protection.
Do you brush it on or soak the wood ?
Jim G on Mar 25, 2017
BEST ANSWER: I brush it on, wait a while and then remove as much as possible with a wet mop.
instructions say to wash off oxalic solution after treatment. I am considering using it on a 14'x14' ash floor that weathered too much before i got the roof over it. What if I do not wash it off? Will this be hazardous to walk on with bare feet?
hank r on Dec 1, 2016
BEST ANSWER: I would strongly suggest washing it up. It is pretty strong stuff. Wet it down with ample water nand use wet dry vac to get up water.

Do you have a DATA sheel for it? Rpocker can supply you with one. It is the law!
If I use this to clean a hardwood bench, will it hurt the few plants that are nearby? Either directly or via groundwater contamination?
Steve D on Jul 2, 2019
BEST ANSWER: Very likely will not be beneficial to the plants. Try moving the bench to concrete if possible.
What is the ratio of bleach to hot water?
Nancy Y on Sep 20, 2018
BEST ANSWER: I just added enough water to make a soupy paste and brushed it on. Needs to be cleaned off after.
Would this work to remove water stains on rough-surfaced, unfinished cedar wall paneling? The water wicked up the walls a few inches in places after a small flood in basement.
Kristin C on Nov 2, 2017
BEST ANSWER: Yes. I used it on an unfinished spruce soundboard in a harpsichord that had water stains. It might take a few treatments, but it should remove the water stains.
Will oxalic acid remove dark brown stain from drips on a concrete paver
Murray S on Aug 24, 2017
BEST ANSWER: I have not used it on concrete stains. I have used it on water stained wood with good results.