My father-in-law gave us an old round oak dinner table that his brother had given him several years before. He said that it had originally been painted white and a couple years ago he stripped off the paint, sanded it, and put a coat of clear varnish on it. The wood looks great but there's a very annoying 3" stain in the middle of the table. We don't know what the stain is from, it's a darkish red color that's a bit darker in the middle than at the edges. My father-in-law said he tried sanding it out but had no luck. Fortunately I don't think he sanded very much.
I've read on here about using oxalic acid for some types of stains and wonder if I should try it on this one? Of course I'll have to strip the varnish off first, but since we want to use this table in our home we have to get rid of that stain first. Will oxalic acid work on a variety of unknown stains like this one? Any advice would be appreicated.
Thanks, David