Mark Bausman writes:

Groop,
 

Lately I have been having a problem with MC based hand strippers.

After stripping and washing the pine (especially) has a brilliant yellow

cast. We used oxalic acid on the leaf two times with little effect.

 

The enclosed photo shows the leaf in yellow and the table top in

natural pine.  Do you know where the yellow comes from, how

to remove it and avoid it?
 

Thanks
Mark B
So CA