Search results for query: oxalic acid

I have just made a desk with a black frame, I played with a few options but ended up with a coat of india ink, cover with some clear Osmo 420 UV oil. It came out lovely and black. Can't help on the white, perhaps look into oxalic acid which is often used to bleach timber.

A quick pass with an electric plane or sander seems the obvious quick remedy. Oxalic acid can help reduce water marks, it also bleaches the wood slightly. It's sometimes sold as wood bleach. For areas this big I'd suggest buying it in crystal form and mixing with water to the desired strength.

Thanks for your quick reply, I did wonder about metal first, I suppose I could try to scrape some off and test it. I don't want to use anything that will bleach the wood as it will not match the rest.

...cosmetically bad state. See photos showing staining. Ive tried gently sanding but the discolouration is too deep, its been suggested that Oxalic acid or Liberon Ring Remover or Liberon wood bleach would clear them so I can refinish --- any ideas or whether those would work? - and then the...

...on oak as it reacts with the tanin and causes tiny black stains. The strongest bleaches are the two-part hydrogen peroxide types (Typically called A&B bleach) from polishing supply houses (Mylands, Jenkins,Fiddes etc. in the UK). It is also possible to combine them with oxalic acid as an...

...Easier to buy a good violin or cello here than a tool. On alternatives, I think most of these are based on 'chlorus' as a friend calls sodium hypochlorite. But much more expensive. Like boat cleaners based on oxalic acid - using a cheap base in an expensive product to do the same thing.

...so I just cleaned those up with scrapers/strippers etc and left them in place. - Finally once they looked 'OK' I went over them with the oxalic acid leaving it 20-30 minutes or so and then washing off with soda crystals in water to deactivate. This cleaned up some of the stains and evened out...

...dry and repeat up to another three times. Rinse with fresh water and allow to dry. If the timber is stained your best bet will be to use oxalic acid. Liberon do a ready mixed solution..... Wood Bleacher: Furniture and Interior Woodwork Repair and Prepare | Liberon wood cares you can repeat...

As above, let it be.... But if you #really# have to, sand it back then apply oxalic acid , lightly rinse off and leave to dry, then oil. But i wouldnt bother, ive seen far worse water staining, its not all that noticeable

I tried that, it worked a little. I'm still tossing a coin to choose which side becomes the face. The weathers hot here in Austria at the moment so i'll take a chance and put it the wood in the sun for a bit. Cheers Andrew

Good job, looks fab. Get some oxalic acid, it usually removes stains and weathering

...is in Upvc cleaner sold by tool station/screwfix can be a handy solvent Where it has soaked in its not just a case of wiping off though If it were me I would try barkeepers friend powder -made to a paste and applied over the top and left for a few minutes- the oxalic acid can help fade the ink

...shower when it went back to its ghastly orange-red. I've tried neat bleach. I've tried mixing up some watery NHL lime. I thought about oxalic acid until a few Youtube videos showed that it only got rid of stains and took the wood back to its original colour ! I'm out of ideas. Any...

Oxalic acid usually does a good job of removing stains and weathering bringing timber up like new. 2 part treatments are often sodium hydroxide followed by hydrogen peroxide. Ive had good results on mahogany using just peroxide from boots

I looked on google after asking the question and apparently vinegar is also used... spirits of salts apoears to be hydrochloric acid! Ive got citric acid and oxalic ( and vinegar )

Try a solution of oxalic acid applied with small brush or Qtips to the stained area. Remember take it slow and easy

I would be tempted to try oxalic acid, but of course you wont want too much moisture on there. Peroxide is possibly an option, its used as 'wood bleach' in a lot of the kits. You can get 9% hydrogen peroxide from boots etc.

Thanks Andrew, I'll pass that on. Of note, sanded prior to the white marks appearing, which sounds odd. oxalic acid sounds good.

Thanks for your reply, i think the wood is teak and can’t see any old varnish so i imagine it was originally oiled , would you still use the oxalic acid or another cleaning method?

...out but the result was great. The decorators were very thorough with lots of filler which I had to winkle out. I agree with the use of oxalic acid to reduce water staining, I would use water stains to lightly colour the beams my favourite was always Van Dyke water stain this is in crystal...