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Thread: Oxide stains on oak due to tanines?

  1. #1
    Join Date
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    Oxide stains on oak due to tanines?

    Hi there.

    I remember having seen some side comments on a thread about oxide stains made by metal being in contact with oak, as next summer I have in mind making a cellar door ( for one of my relatives) with old forged iron rescued nails and humongous lock from the old one I wonder if those stains can be avoided or if they will just add some rustic character to the new door.

    The door will exposed and subject to big temperature variations, from 10 below zero centigrade to 35-38 positive, rain and snow.

    Any hint will be greatly appreciated.
    Best regards,
    Toni

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    I also dream of a shop with north light where my hands can be busy, my soul rest and my mind wander...

  2. #2
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    Toni, I'm not positive, but I'm pretty certain the forged iron nails and the lock will stain an oak door, and don't know how you would prevent it (at least permanently). I think it could look pretty cool if that's the style you're after.
    When the going gets weird, the weird turn pro. - Hunter S. Thompson
    When the weird get going, they start their own forum. - Vaughn McMillan

    workingwoods.com

  3. #3
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    Hi Vaughn.

    I don't know, because I do not know how will those stains be, which colour and how will it affect the whole appearance of the door.

    Will it look aged? Or as if someone smeared dirt on it? or will they be like dark streaks dripping down from the nails? That's why I am asking, if i could see an example I could make up my mind, maybe I'll have to find a scrap of oak and dig some nails on it and leave it outdoors for a couple of weeks,
    I don't know....
    Best regards,
    Toni

    __________________________________________________ __________________________________________________ _________________
    web site:http://www.toniciuraneta.com
    I also dream of a shop with north light where my hands can be busy, my soul rest and my mind wander...

  4. #4
    Toni

    Any ferrous metal in contact with oak will give you inky-blue - black staining. It is not attractive. I know of no way to prevent it apart from niot using ferrous metals with oak or oak with ferrous metals. Same thing to a lesser extent with cedar and any other wood containing tannin. If you get staining you can usually remove it with oxalic acid but the only real way is prevention. Use brass, bronze or stainless fitting with Oak.

  5. #5
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    Hi Ian.
    Thanks for the info, I was thinking about putting some barrier material on the iron pieces prior to mounting them like clear lacquer, wax or something similar but most problably it won't last or won't work at all.
    Best regards,
    Toni

    __________________________________________________ __________________________________________________ _________________
    web site:http://www.toniciuraneta.com
    I also dream of a shop with north light where my hands can be busy, my soul rest and my mind wander...

  6. #6
    The problem is that even if you coat the surface if the fixing is in the wood the staining will come from the inside out, anywhere the nails/screws are in contact with the wood. . You might just be very lucky but.....

    The other reason to avoid iron/steel in Oak is that the same reaction that causes the staining causes rapid corrosion of the fittings. So not only is it ugly, its not good for durability either.

  7. #7
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    In [THIS POST] Sam Blasco didn't mention what kind of wood he had recovered from old pallets, but the lighter colored wood in the photo could certainly be oak.

    The black marks in that wood look like oxide stains to me, and should give you an idea of what to expect....

  8. #8
    Good spot Kerry - i think they are oxide stains too but they kind of give the lie to my saying that they are not attractive.

  9. #9
    Join Date
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    Well, I didn't want to say the stains were ugly (for Sam's sake) but I didn't want to say they were lovely either (for your sake). So I didn't say anything!

    As with most things, it seems to depend on what you're trying to say with the piece. I think Sam's piece speaks well for itself.

    (How's that for diplomacy? )

  10. #10
    Quote Originally Posted by Kerry Burton View Post
    Well, I didn't want to say the stains were ugly (for Sam's sake) but I didn't want to say they were lovely either (for your sake). So I didn't say anything!

    As with most things, it seems to depend on what you're trying to say with the piece. I think Sam's piece speaks well for itself.

    (How's that for diplomacy? )
    I wouldn't use the word lovely but I really like the effect that they lend to Sam's piece. I think that it is probably because there are a fair few of them and they are in the field of the piece rather than attached to a fitting of some sort. I actually like the way that they make the wood look like it has worked hard for its living so far and now deserves a rest in a beautiful piece like that. Pallets eh? Who'd a thunk it.

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