I am picking up a two horse power four row seed drill made in Dayton Ohio in the 1890's. All original and complete. I am not a wood worker nor do I play one on TV. The hand lettering is still visible on the back of the box with a painted mural. Lettering on front of box is harder to read. I was told rubbing linseed oil on the wood will make the lettering more visible. If this is true do I use Boiled Linseed oil or Raw linseed oil or some other product. No intention to restore, just want to preserve.