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
What would cause this type of stain and might there be a chemical remedy?
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
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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