Dark Water stains on wood

[andrewpreece]

Yes, oxalic acid is one such, I have used it and it does have an effect.

Andy.

[MG]

Hi

Anyone know how to get out the black staining caused by water on light coloured wood?

Is there such a thing as a wood bleach?

Cheers for any enlightenment!

Mark

**REMOVE** 'myhat' from my return email address before sending!!

[Andy Dingley]

Maybe - it all depends what caused it. There are several sorts of stain, some of them are almost irremovable. Try some light planing first, if possible.

Several sorts. Hypochlorite bleaches like Domestos - not much use.

Oxalic acid (Barkeeper's Friend, Patio Deck Cleaner) - good for tannates, such as iron stain or most stains on oak or chestnut.

Hydrogen peroxide. - commonly sold as "wood bleach", it's a two bottle process. Make sure it's fresh stock, as it doesn't keep well. The first bottle is caustic soda to make the surface alkaline, the second is the strong peroxide. Don't mix them before use. Works best on the natural colour of the timber, or on black moulds.

Try planing first. If it's not obviously oak or iron, then go for the peroxide bleaches.

[The Natural Philosopher]

ah! wait till next years rhubarb crop and boil up some leaves then...