A copper naphthenate and hydrocarbon solvent wood preservative that may be brush applied for surface protection of most woods. Dip soaking or pressure impregnation of copper-green will result in deeper penetration resulting in longer preservation of treatable species. The copper in copper-green reacts with the cellulose of wood. As a result it is not easily lost from the wood by leaching. This formulation extends the service life of wood products.