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Oxalic Acid

Posted by Kimberly  
Oxalic Acid
September 30, 2004 02:32AM
Is Oxalic Acid sold under a brand name? I went to Home Depot to get some and they had no idea what I was talking about!!

Does anyone know where else I could try finding it...other than online??

Thank for your help!!

Kimberly (^o^)
David Von Bargen
Re: Oxalic Acid
September 30, 2004 02:36PM
It is an ingredient in some wood bleaches (DAP). You might have better luck looking for it at a drug store.
Chris van Laer
Re: Oxalic Acid
September 30, 2004 03:48PM
Oxalic acid can be purchased from a local drugstore, but it's purity is usually "reagent grade" or pharmecuetical grade, making it very costly. I use oxalic acid not only for mineral cleaning, for which it has no equal, but also in the gold refining process, as it precipitates pure gold from solution. I use a great deal of this in my shop, and we buy it bulk by the kilo (12 kilos at a time), and because it's "technical grade", it's not too expensive. As a result, we sell one-pound containers of "excess" stock to local mineral collectors for the purpose of cleaning minerals. Because of the commercial nature of this, I believe it's inappropriate for me to offer my product through this website, but you can contact me at my return e-mail address if you need any further help.
Franklin Roberts
Re: Oxalic Acid
January 04, 2005 09:26PM
Oxalic acid is also the main ingredient in several brands of OTC car radiator flush. Run on in to your local auto parts store and start reading the fine print on the labels. The only other ingredients mixed with most of these products are usually surfactants (wetting agents). If anything, the presence of these will improve the performance of the OA in your specimens by allowing the solution to permeate into the tiniest cracks and voids to do its thing.

Franklin Roberts
Austin, Texas
H Sunderland
Re: Oxalic Acid
January 08, 2005 12:11PM
I have a small bottle of Oxalic Acid Crystals. As I remember from chemistry days, if I dissolve the crystals in distilled water - warmed, I will get a supersaturated solution.
I have a specimen of Barytes which is partly coated with - I think- Limonite.
I don't think it is ordinary Iron Oxide (i.e. Rust).
In any case regarding rust, you can buy rust remover from car accessory shops.
It goes under the name of 'Jenolite'. Though I think the industrial concentrate is more potent than that sold in shops. Jenolite contains Phosphoric Acid (as in washing powders I believe) among other things.
Isn't there Oxalic Acid in Rhubarb?

Anyway, how do I get rid of the Limonite on my Barytes?
Should I immerse the specimen in hot concentrated Oxalic Acid?
These Iron compounds tend to be quite complex.
I have managed to physically chip away some of it.

H Sun.
Re: Oxalic Acid
January 08, 2005 02:33PM
You don't need hot concentrated oxalic acid; dilute acid at room temperature will do fine... IF your "limonite" is really that (Fe''' oxyhydroxides). If the brown crust is something else, the oxalic acid won't work.

H Sunderland
Re: Oxalic Acid
January 10, 2005 01:07PM
Thanks Alfredo, it remains to try it. Its a bit of blue Barytes I have, so its worth 'having a go'.

H Sun.
Re: Jenolite
April 25, 2006 11:37PM
Hi everyone,

Just to let you all know that you can get jenolite again, just go to there website or if in the UK go to

It is excellent rust remover, contains phosphoric acid so nutralises the rust better than any product I have ever used. Makes similar brands like hammerite and fertan products look like water!!

Jenolite also told me that they are planning to have the liquid form back in stock by summer so its back to business for all us that want a reliable well respected rust remover! I am over the moon that it is finally available again.

Good luck to you all.
avatar Re: Jenolite
April 26, 2006 01:13AM
There's a product that I use to remove iron staining that works real well, it's called Iron Out and it's available in large quantities of the powder at hardware stores (it's about $5.00 US) and it'ssafer than oxalic acid too, you don't need to take any special preccautions except working in a ventilated area (Gives off fumes of SO2). It's active ingredients are Na(HSO4) and Na(HSO3).
avatar Re: Oxalic Acid
April 26, 2006 07:10PM
Oxalic acid can usually be found in Home Depot-type stores (here in the US) sold as "wood bleach". I have seen other chemicals sold as wood bleach as well, so read the description of the product to make sure of what you are getting.

The active ingredient in "Iron Out" is sodium dithionite (also called sodium hydrosulfite). This chemical is not acidic, and is a better choice for removing iron stain from delecate minerals than oxalic. It is also less toxic. See the thread on cleaning fluorite for a more complete discussion.
Deb S
Re: Oxalic Acid
May 24, 2006 08:33PM
"ZUD" a cleanser available at a lot of grocery stores, will take away iron stains.
Re: Oxalic Acid
August 03, 2006 03:56PM
To the best of my knowledge, "ZUD" cleanser is oxalic acid based. It's next to the Comet and AJAX cleaners in a lot of the larger grocery stores. Try reading the label first, memory doesn't serve very well anymore.
Re: Oxalic Acid
August 13, 2006 09:25AM
And what about to contact large chemical shops and just buy online anything that u want?


If its not marked as a poison or very dangerous chemical theres no problem:) Im not sure about USA but in Europe I can buy most of chemicals when Im over 18 years including strong mineral acids etc.
Re: Oxalic Acid
August 13, 2006 10:45AM
I haven't read the thread so I will just highlight the OA dangers, the big one is mainly to do with blood and attacks the iron in blood and reduces it's ability to clot (stop bleeding) so prolonged exposure will presumably make you susceptible to bleeding to death...!
Just treat it with respect and you will be fine.

Re: Oxalic Acid
September 12, 2006 11:05PM
I bought my oxalic acid from a professional painters' supply store. A 20kg sack of it was about $1/lb, as I recall. But I go thru alot of it in my cleaning.
Re: Oxalic Acid
November 01, 2006 10:15AM
i live in south africa and none of the drugstores could help me so i got a hold of one of our local chemical suppliers through the phone book and they were able to supply me in bulk at a good price
Re: Oxalic Acid
November 01, 2006 12:13PM
I live in New Zealand and obtain my supply of Oxalic Acid from chemical companies who supply chemicals to clothing dry cleaners etc. They use it to take rust stains out of clothes, materials etc. Not sure about USA, but this is far cheaper than buying it as wood bleach or for cars and it is available in bulk via this way. Might be worthwhile having a chat to a laundry or dry cleaning store owner.
Mark Rheinberger
Re: Oxalic Acid
December 02, 2006 09:44AM

Here in Australia, well in the state of New South Wales at least you can buy Oxalic Acid from Some Paint stores or Hardware stores. Not all keep it but ask and I'm sure they will get it for you. Don't buy it in liquid form, buy it in granuler form it goes much further.

One product name is "Diggers" and there is another maker but I can't recall their name. The last Oxalic acid I bought was a 1kg bottle and cost about A$26.00.

Jon Ertman
Re: Oxalic Acid
December 02, 2006 03:07PM
I use muratic acid and mix with distille water,and works faster,Jon.
Re: Oxalic Acid in rhubarb?
December 02, 2006 05:49PM
H Sunderland Wrote:
> Isn't there Oxalic Acid in Rhubarb?
> H Sun.

not sure. i do know there is oxalic acid in Lamb's Quarter, a common garden weed. it is also quite nice in a salad. eat some dairy to counter the effects of the OA. perhaps you could make a tincture of lambs quarter to concentrate the OA in it.

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