Search results for query: oxalic acid

...is your man. Best of luck finding a good one these days though, stuff available to the public tends to be a bit pants now :( Once you're down to bare wood any discolouration in the wood where the water stains are now that you need to sort before continuing, oxalic acid should do the trick.

...introduce your own staining when you work the wood as the tannin is likely to react with any contact with iron or steel tools. Especially if you use a water based glue and steel cramps... DAMHIKT...! As Woody says, Oxalic Acid will get rid of the stains when you're ready. regards Brian

I use a bucket of oxalic acid (as found in Rhubarb) and some soaking time - it works a charm. It's also handy for wood bleaching if that floats your boat. It's available as crystal concentrate off eBay for not very much. Google "oxalic acid rust removal" and you'll find advice from a bunch of...

...to every organ in the body. It works by chemically attacking the paint, it is messy and still requires scraping. With reference to Oxalic acid as mentioned by ED65 - I think he was referring to water damage in which (mostly) Iron in solution gets into the wood and reacts with tannin turning...

Though I say it myself, the grain match I got is actually pretty brilliant! Just happened to find a bit of some tropical hardwood (it's definitely not cherry!) with identical directions of interlocked grain, so at least don't need to learn graining as well. You are probably right that taking...

The oxalic acid should remove some of the stain, it can remove iron stains in oak I have found, but never tried on cedar. It's cheap so give it a go, or just stain and move on.

...any of the other nonsense that kept getting trotted out. Chiefly the timber was oxidised with dilute Nitric Acid, possibly bleached with Oxalic Acid or a two pack solution, and then the patinated surface was carefully built up and stained as required. Distressing was a pretty clinical process...

...removing the worst of the blue/black bits (the trick will be to do that without using steel tools and creating more stains when the moisture content is high!), but I really don't think it matters. If you're very fastidious about the stains you can use oxalic acid to get rid of them. Cheers, W2S

I had a problem with an AWO front door turning black in patches after being finished with danish oil As custard states oxalic acid works well in getting rid of iron staining (whatever happens stay clear of wire wool) I refinished it with osmo uv Hard Wax Oil and never looked back, did it two...

Ordered Oxalic acid from Ebay. My scrapers don't come until next week anyway so may as well wait. MusicMan - You know how to make my brain hurt! Droogs said to use a blonde shellac, then wax it. Is shellac the same as a stain or dye? I don't know the difference between a stain and a dye, but...

...I thought at first it may be steel contamination but now I think it may be some kind of fungal stain. It's easily removed with oxalic acid. Perhaps Richard (Sibn Duhb or whatever he's called) will be along with more detail. I don't think the corrugation you are getting is due to the veneer...

...so does not leave the wood in a dead flat condition. Bleach wash - not sure I did this right as the wood didnt go very light. Used some oxalic acid from ebay. In the end the whole deck has been pressure washed and oiled with some UV deck oil. It looks much darker than last year now, but...

The active ingredient in the Ronseal (and all other commercial decking cleaners) is benzalkonium chloride, http://en.wikipedia.org/wiki/Benzalkonium_chloride a very mild cleaner, the oxalic acid will have a much more powerful and noticeable effect if that's what you're looking for.

It kind of depends if the black staining is an old finish or a discolouration of the natural wood. If it is the wood, then try oxalic acid, but be sure to rinse off and neutalise before trying to refinish!

Rob, here's the thing about iron staining Oak. The wire wool/white vinegar is the easy bit, you can be pretty cavalier about that part of the process and still get an adequate result. White vinegar, apple vinegar, dilute acetic acid, a handful of wire wool, a healthy pinch of iron filings, 48...

striping with paint stripper will remove coloured finishes and alot of the stain if its in the wood. Going further you can try oxalic acid or 2 part wood bleach.

...that makes sense! Thanks all! Shows I really didn't know what I was talking about, which is not a surprise. I might have a go with some Oxalic Acid just to see what effect it has, but can see that darkening them is probably the only way to hide the stain fully. They're already probably a bit...

you could try wiping a solution of oxalic acid over the surface and letting dry then washing off. OA traditionally rids black stains from oak but ideally on the bare timber. Doubt you would have had this prob if using spirit based varnish...

...do. Who knows, in 40 years I may know enough to stop pestering you guys! The black marks I Googled, and found they lift out easily with Oxalic acid. Trouble is, I can only find it online. I want it now! Does anyone know where it can be bought on the High Street, or some cleaning product that...

...as it's gone grey and has various places with black spots where, what I can only assume is mildew, form on it. (Those I'm going to use oxalic acid on) Jacob I've already told them that I can only make it "like new" for a significant amount of effort, and although I could do it, removing all...