Zinsser & Co 1901 Green Wood Preservative
This is a different sort of wood preservative, primarily intended to protect wood from termites and other wood eating insects. It gives the wood the green tint of being pressure treated, although that isnt what it is doing. The green color comes from the copper oxide that is in the product. AT the same time, it protects the wood from rot and decay, like other wood preserving products do. This product is most effective when applied to wood before it is put in the ground.