Search results for query: oxalic acid

Dom, You may be seeing iron stains. I would be very surprised if the issue is mould. Oxalic acid soln removes iron stains see my book 3 the finishing section. David

Reference to food and oxalic acid in the same message prompts me to offer the respectful reminder that oxalic acid is a nasty poison that does irreversible damage to the kidneys. I don't know what would be a fatal dose. Our garden rhubarb is now finished so I can't try the idea, but I wonder...

Oxalic acid is the trick. I've been restoring wooden boats for over ten years and it never stops surprising me how watermarks disappear with the acid. Oxalic acid is crystals as citric acid and they are mixed with water. My mixture is to add acid to hot water as long as you get leftover...

If it is a stain caused by contact with iron (like a clamp or steel wool), it can be removed with dilute oxalic acid.

Oxalic acid , you may need to order it from a chemist and tell them what you are using it for . It does bleach the wood even though they say it wont .

Further to my previous reply here's a photo of the staining: Not having any oxalic acid to hand, I experimented on a scrap piece with "Milk Stone remover" - phenolic acid - worked a treat - stain gone in a few seconds. Do not know what it will do with the timber long term though? Washed...

It was part of the thread on Oxalic Acid (Rhubarb). I tried some "Milk Stone Remover" which is concentrated Phosphoric Acid - used to clean rust off old tools etc. Cheap way to buy Jenolite - bought from farm suppliers about £9 for 5 litres. The Titebond III I used stained the wood blue...

Sounds a bit too cautious to me. The bugs in the compost heap will make shortish work of the oxalic acid, unless you had nothing but rhubarb leaves. But in terms of woodworking, has anyone tried extracting the acid from the leaves to bleach timber?

Have always understood that it was the leaves which were poisonous. Oxalic acid solution is extremely useful and I wrote it up in my third book of articles, "A guide to Handtools and Methods". One of the best applications is the removal of muckiness on oak and other timbers high in Tannic acid...

Oxalic acid is found in a lot of the foods we eat although in far smaller concentrations than in the product used to remove the stains. You'll find it in addition to the rhubarb, in strawberries, chocolate, nuts, tea, wheat germ, spinach, and more. How do I know? I had a blast of a time with a...

Hi David. You may like to try 'Oxalic Acid', looks like the one you are looking for. http://www.woodzone.com/articles/wood_bleach.htm. Never used this particular one myself, so good luck.

Hi there, Received the Oxalic Acid yesterday in the post and used it today. The very fine crystals (almost like a course powder) dissolved very quickly and did a wonderful job of getting rid of the stains. I had to go over the heaviest stain a second time but the wood is fine now, just got some...

ah, is there an answer to this after all..... ...bit of a head ache just now.. :roll: TVM Tam

...on out beech kitchen counter top from a can of fly spray that was lying on the damp surface. I was going to try to get it out with oxalic acid. Questions: 1. Is this what I should be using? 2. If it bleaches out the stain, will it bleach the colour out of the wood so that I have to stain it...

Oak contains tannin (as does walnut and to a lesser extent true mahoganies). Tannin combines with any free moisture (from the air, water spills, water-based finishes, etc) to form tannic acid which will attack any ferrous deposits, such as tiny particles of broken off steel wool trapped in wood...

oxalic acid is allowed to dry and repeated if necessary. you will have to do the whole peice. then wash off with water.

I'm with Paul on this one. Personally I don't like installing oak worktops because people don't maintain them and if wet steel/cast-iron pans, knives or utensils are left on them in an area where the finish is thin or absent you can get indellible black stains (ferric oxide, caused by reaction...

Scrums - Ooooops.....I'm very wary now about wire wool and stuff like that on oak. I did use once tho' some oxalic acid in solution to neutralize the black marks and then that was itself neutralized by somat else but I can't think at the mo what it was :? - Rob

Here is info on oxalic acid herebut you might be better off using this

Having been experimenting with this stuff recently I wonder if you might have found a layer of casein paint, otherwise called "milk paint". Unlike oil-based paints milk paint seems no to be susceptible to conventional paint strippers, but I've found it will come off if you apply a strong mixture...