Moving on to the metal decorative parts on the roof , we have the chance to inject some bright colour to the model. In many cases on older buildings, we find that many decorations or cap parts of roofs are made of Copper or Bronze. When these materials are exposed to the elements they corrode in very bright colours, a bright green and blue respectively.

To begin, we use Vallejo Game Colour Tinny Tin to basecoat the parts we want to be metal.

Next, we apply a drybrush of Vallejo Game Colour Hammered Copper. This is to brighten up the bare metal, just in case we want to retain some of the base metallic finish.

Using a smaller makeup brush than the one we previously used to give us a little more control while applying the colour. This process doesn't take long and we can consider it an optional step.

To begin the process of creating the patina effect, we are using two paints. First is Vallejo Game Colour Turquoise and we are going to mix this with Citadel Contrast Medium. That way we can create a wash that will be a little more effective in getting the colour right into the recesses. Since the detail on these particular parts is rather shallow, the Contrast medium will aid in the application.

Mixing the two paints by eye, roughly a 2:1 mix of Turquoise and Medium, and applying it over the metallic areas carefully gives the paint a chance to settle in and around details such as the large rivets on the roof cap, helping to sell the effect of the patina gathering more where the metal is joining other metal.

One thing to remember when making your own wash is that if you are applying it over a darker surface, it will not be overly vibrant. In this case, it has tinted the metal detail rather than given a true effect of patina. With that in mind, the next stage is to add a drybrush of Army Painter Toxic Mist. This should give us the more powdery effect that corroding Copper and Bronze accumulate.

Using the smaller makeup brush again, and applying two layers of drybrush to the parts will help bring up the vibrancy, and, with another pass of our wash mix, we will have a finished effect.

The final look is nice and vibrant and maintains a little bit of shading through the second application of the wash.