oxalic acid
I restored an old buffet that was in my mother-in-laws basement. It had a huge black spot on one end that was always covered up. The buffet has a veneered walnut top. I just followed instructions on the container and it worked beautifully. No issues with the veneer. After I got it all cleaned up I restained it with walnut stain and then a coat of amber shellac. I used a fresh can of shellac, siphoning off the top and not stirring up the wax in the bottom of the can. Then a coat urethane. Nobody wanted it and it was the last thing left in the house. Now they think I'm a miracle worker.
I restored an old buffet that was in my mother-in-laws basement. It had a huge black spot on one end that was always covered up. The buffet has a veneered walnut top. I just followed instructions on the container and it worked beautifully. No issues with the veneer. After I got it all cleaned up I restained it with walnut stain and then a coat of amber shellac. I used a fresh can of shellac, siphoning off the top and not stirring up the wax in the bottom of the can. Then a coat urethane. Nobody wanted it and it was the last thing left in the house. Now they think I'm a miracle worker.
