Search results for query: oxalic acid

AK-47? Or do you mean the felt tip? I'd try dilute oxallic acid, although it won't remove so-called permanent inks. Scrit

oxalic acid should remove your stains

Thats really interesting about the Oxalic acid Colin. I don't doubt you at all (I know restoring is your bag) but I don't understand how a bleach (which I thought Oxalic was to all intents and purposes :oops: ) brings the colour back. Can you explain a bit more please? Cheers Tim

Hi JFC It can happen some times if the oak is still a little wet or has get damp with some water if it was out side for a little while. You can get it out with Oxalic acid if it is already finished to size :)

...- household bleach. Actually for wood it is usually made up from sodium hypchlorite - same stuff basically though. A very popular one is oxalic acid, often sold as wood bleach and can be found in places like B&Q some of the time. This is used to get stains out of wood caused by eg wet iron...

...... =64&c2=329 http://www.structural-engineering.fsnet.co.uk/loads.htm But I got 500grm from my local chemists of all places who I get my oxalic acid crystals from, He had to order it though. But there are plenty of links to it in the USA especially under the name gilsonite. :)

...some mfrs. call it. One part is caustic soda, the other is hydrogen peroxide) This works very well for removing colour from wood - don't bother trying oxalic acid or chlorine based bleaches, they don't work for this. You will need two or three applications and you can make many woods paper...

...have to use other chemical treatments to darken the wood again. There is a good treatment involving the two pack bleach, acetic acid and oxalic acid which can be used to give a patina suitable for old furniture but I don't think this is merited in this case. If you really want to try...

I go along with the fungus attack, I would wash it down with a mild bleach solution, let it dry THOROUGHLY. Then using an OXALIX ACID dolution this will draw out the colour.It may take 2 or 3 washes. Use the solution wet on wet, once washed down let it dry out and then to counteract the oxalic...

Thanks Chris. I have some Oxalic acid so will give it a try and let you know how I get on. Andrew

My first thought was oxalic acid or a wood bleach but the link below will give you a cheap alternative, I use it on teak decks. Don't bother ordering it from the USA website, I get mine from the local chemists. http://alsnetbiz.com/homeimprovement/oxybleach.html

...like a job for a bleach. There are three basic kinds in ordinary woodworking:- 1. Chlorine based (like kitchen stuff but stronger) 2. Oxalic acid 3. Two part (Sodium Hydroxide and Hydrogen peroxide) I have no experience with (1). (2) is used for eg removing black marks from oak that has...

...walnut mixed up as thegrain is almost the same unless you have worked with it abit To try and get the colour back, you might want to try Oxalic acid first, it can be bought already mixed or got to a polish supplyer and get the powder to mix the hot water. Just make sure you use gloves and...

...anywhere? How much do you need? And by the way does anyone have a UK mail order source for small quantities of other old fashioned chemicals like Sodium Bichromate, Oxalic Acid, powdered rosin etc? The jar of bichromate that I had to buy locally will still be there after I am in my veneered box.

...this problem. It's a matter of waiting several months for the sun to do its work, or you could if neccesary lighten it with a solution of oxalic acid (usually ordered in local chemist). For a finish I prefer a satin finish water based polyurethane, but thats my preference, you may prefer to...

Liberon do a "Wood Bleach" based on oxalic acid although I don't know if it neutralises water based dyes. Ike

Yes Steve, I've used the Liberon Wood Bleach (it is oxalic acid) on mould damaged oak. It worked very well at removing seriously bad mildew stains (although 2 applications were necessary) It should lighten most timbers to some extent and as far as I am aware, it is permanent. Ike

well Steve, you have to use fresh bleach as 1 oxalic acid has a shelf life of three months when in liquid state - better to go and get oxalic crystals and mix with warm water when required. Downside is you have to sign the poison regisater or prove that you are a professional woodworker...

...in Turning). Figure is beautiful, but the colour is a bit dark. Has anyone ever tried using bleach (the Liberon stuff - I think it's oxalic acid)? If so, does the lightening last or is it just temporary? I have an ancient bottle in the cupboard, no idea if it has a shelf life. I may just have...

Steve, Three kinds of bleach are generally used, 2-part (caustic soda/hydrogen peroxide); Chlorine; oxalic acid. The last named is good for stains eg black stains caused by iron/water on oak. Chlorine bleaches are general purpose and may or may not work very well on wood colour or stains...