Search results for query: oxalic acid

On the back of this thread I bought some of this from the same people (Construction Chemicals) because of an exact same problem with some oak that I had planed for a job a couple of years ago that never got started. It works a treat (although read the instructions for dilution very carefully)...

You could try oxalic acid. You've not much to lose at this point.

...of flowers and a big ink stain from homework some time in the 1960s or 70s. 2. Strip off all the old shellac. Bleach out the ink with oxalic acid, realise it now has pale areas so bleach the whole lot. 3. As it now looks insipid, buy some potassium permanganate, because some other bar...

...on the floor is incapable of preventing the water from damaging the timber in the first place it does a passable job at stopping the oxalic acid from reversing it. You will probably find that you need to scrape back the damaged area to bare timber before applying the oa then refinish once...

...to lighten the existing stain, then iron (and coffee if necessary) to match on the rest, but maybe that won't work because any excess oxalic acid will mop up the iron ions. I need to make some experiments. Maybe I can write the expresso machine I've been wanting to the 'home improvement'...

...any solution with a good level of iron would do the job, but this can also be varied according to dilution with water. I don't think the oxalic acid once applied and dried will have much of an effect on anything put after, even though it'll remain in the wood the acidic solution you use...

There was a thread on here a while back. I can't credit the original author but the advice was: "Scrub it with Oxalic acid. Buy it in crystal form on eBay, mix it with warm water and get on your knees with a scrubbing brush." For a finish coat try this...

...the visible staining was going to remain a permanent feature after my efforts with the other solvents I mentioned........ Concerning Oxalic acid, is this the same as 'deck cleaner' as found in B&Q and the like? Is there a particular brand that performs better than others or can I actually...

Was also going to suggest oxalic acid, but it looks like the OP has already sanded through the veneer, so will need also to do something to hide the patch of ground. Maybe find an old treatise on graining??

...So she had a look on t'interweb and decided she needs a Festdrool Rotex. I'm going to set her on cutting M&T's for her next job. The oxalic acid treatment worked to some extent, but the nail stains are just too old and deep to bleach out, so we're going for blending. For staining do you...

Re. the bleaching results, oxalic acid is a particular type of wood bleach and is basically for iron stains (from direct contact with iron, or from iron salts in water which is mostly with tap water). Oxalic is good stuff, you'll be glad you bought it for the jobs it's the mutt's nuts for, but...

There's not much chance of getting an acceptable colour match from bleaching alone, what you should be aiming for with oxalic acid is to get a bit closer and take out any dominant and assertive colour tones both from the patch and from the top in the surrounding area. Basically you want the...

You need to get some oxalic acid, you can buy it in crystal form from Fiddes in Cardiff or Liberon sell it in liquid form under the name of "wood bleacher" http://www.liberon.co.uk/repair-and-pre ... kmfA%3D%3D If you get the crystals, melt a small handful in a jar with some near boiling water...

Oxalic acid might clean that up.

...which can occur through covering paint. If that might be it you could try a cleaning product specifically made for tackling those, but oxalic acid probably does the job better than anything. If you get oxalic handle with caution, it's quite toxic to the person using it. Lots of people...

Well if you wanted to remove them or reduce to some extent - oxalic acid fairly strong will help 1:1 ratio with water. Comes in a powder. Alternatively, if you were thinking you might be OK with the dark look you could try the old "steel wool in vinegar" to darken them to blend in the stains...

...off but if they are veneered then you risk cutting through the no doubtfully very thin veneer. The only other thing you could try is some oxalic acid but make sure you take the proper precautions. Personally I would try and work with the existing finish to create something more to your...

It took a while just cleaning the grime off this desk. It must have had many years of solidified dust on it in every crack and cranny of which there are many. The guy who I got the desk off told me that he had bought it at in auction in York over a year ago and it had been sat in his garage ever...

Hello, I have seen this stain before in quite a few restores. Results of iron nails+moisture reacting with the natural tannins in wood. Oxalic Acid should work but can be some nasty stuff even diluted. Myself, I have had some great results using citric acid, lemon juice in fact. I would give...

One last question.....I've looked up how to remove these black stains and oxalic acid seems to be the thing to use? Before I take it all off and commit to replacing it, do you think it's worth trying to get the marks off with oxalic acid? thanks.