Search results for query: oxalic acid

...staining in some new oak that I want to use rather than discard as it has other wanted features. I have read in several places that oxalic acid is the stuff to use as a bleach to get this out. I've got some crystals on order but looking for hints and tips on using it. Questions are...

I believe it is the uric acid exuded through the skin which causes rust, and black marks on any wood high in tannin. Dilute Oxalic acid solution is great for cleaning up wood. David C

Welcome to the forum, Donna. Alcohol will take it off. If you want to get rid of the black staining try a saturated water solution of oxalic acid. Wash it off with clean water and allow to dry. The water will probably raise the grain so you will then need to re-sand. Shellac is not the most...

You should be able to get Oxalic Acid from any good chemist.

Many thanks Roger - it'll be interesting to find if this is a problem in the UK that the timber millers face; wetter here but not so warm. I found a website for the stuff you mention http://www.archchemicals.com/Fed/WOLW/P ... efault.htm The oxalic acid use is useful as well - thanks Rob

Oxalic Acid might work, it shifts iron stains from oak regards Brian

Yep, oxalic acid is the one, just be careful to only apply it to the stained patch, otherwise it will lighten the surrounding area

Solvent to clean out the "pores", clean down, then look at Oxalic Acid, though that involves washing of with water IIRC, so you would then need to chase this out and oil/wax. AT YOUR OWN RISK though, sorry guys! Once up and running try a proprieraty anti slip coating expensive but in liquid...

You might be OK with slightly warped panels for your doors as there will be a much thicker frame all round to hold it flat. I am a recent convert to oxalic acid treatment see https://www.ukworkshop.co.uk/forums/oxal ... 43878.html Bob

...like this but it seems a shame to hide what is otherwise good wood. Does anybody know of a way of lightening the colour? I thought of oxalic acid as that will remove stains, but a whole board? What about hydrogen peroxide? Both chemicals are, I believe, bleaches and so should lift the...

...on the horizontal sills as water seeps in under the edges and gradually turns grey. However, Osmo have a product called Wood reviver (Oxalic acid solution of some type we think) that works brilliantly at removing the grey. Simply pour onto the affected area, scrub with a coarse brush and wash...

Just hearing the word "acid" sounds ominous. But oxalic acid is easy to use and the safest for the home. In fact it is found in many vegetables including spinach, and rhubarb. Perhaps its best known use is that as a wood bleaching agent. Exterior wood tends to turn a dark gray after being...

I have had some success boiling Rhubarb, oxalic acid, great for bleaching wood. xy

...sanding which will just about ruin any "patina". Instead consider a wash with a scrubbing brush and soapy water and then bleach with Oxalic acid to even out the colour and dirty marks Has some dings and divots. SOLUTION EUREKA. Get some clear epoxy and some metallic sparkly dust ( I like...

Nice job...as a matter of interest, where can you get hold of oxalic acid? I also recollect that the acid was neutralised afterwards with a boric acid wash? :duno: - Rob

...any water being splashed on it while it dries, maybe cover it with a piece of plastic or something. You can probably treat it with the oxalic acid before it dries as I seem to recall that you have to wash the acid off after use anyway, then you can let it dry and apply a waterproof finish...

Oxalic acid will remove the stain :wink: or you could try wood bleach comes in parts A+B But will lighten the oak as well Yellowbelly

Yes rhubarb does have some oxalic acid in it but not a great deal. I have some crystals here and can send you some if you want to experiment. Bob

Thanks of the tip about oxalic acid I didn't know about that. I'm going to need to re-saw a few boards for door panels etc so It'll be interesting to see how that goes. I don't currently have a bandsaw though so that will have to wait.

John, Another possibility would be to bleach out the water staining. I've just done some oak using oxalic acid and very impressed with the results. even with fiddling round making up the solution and applying it, in less than 30 mins the stains were gone. Bob