Wood apparently stained by lath?


My BIL is helping someone with a home renovation which involves gutting a 100+ year old house. The original walls were plaster on lath which has been removed. They would like to rebuild in such a way that the original structural members are visible. (I have not seen it but I assume that it must be post & beam construction). The structural members are some type of confer. It is unknown what type of wood the lath was.
The problem is that the lath apparently left a dark brown stain where it contacted the structural wood. The stain is not just superficial. it goes in at least 1/8". Pressure washing and sandblasting were attempted with no success.
What would cause this type of stain and might there be a chemical remedy?
Thanks,
Steve
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Paint? Probably not what you wanted to hear. Semi transparent stain? probably better than paint but will still leave a bit of evidence.
Bleaching probably wouldn't work but you could try. oxalic acid is often used for wood bleaching.
Second google hit found this http://alsnetbiz.com/homeimprovement/oxalic_acid.html
Good luck

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Stephen M wrote:

Cause is probably plaster reaction. As someone else noted, almost surely it could be bleached out w/ oxalic acid, but my question would be "Why would you want to do that?" Would seem the character of 100+ years would be desirable...of course, after the previous adventures outlined above, there won't be anything left so may as well give it a go...
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On Tue, 14 Jun 2005 09:15:45 -0500, Duane Bozarth
The "character" of 100+ years often looks quite different to what 100+ years looks like.
Certainly in interior design.
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