"Patina" is a difficult color to work with. Copper liquid and copper sheets take a decade or more before the patina starts to appear. If you push the aging process along with an acidic wash, then the result depends on the composition of the acidic wash, the humidity in the air--in short, the result is difficult to predict.Trying to mimic a coppery patina into a water-based formulation is also problematic. The result is a flat, matted appearance versus the truly coppery patina that changes definition according to sunlight and angle.
With all the above being said, on the tin roof color page, a lovely wheat-tinted siding blends well with the water based patina.
