The Secrets Behind Beautiful Patinations

Blue verdigris patination on a Mimeo Cascade water feature

Patination is the attractive blue or green or brown colouring that develops over time with exposure to the elements on some metals, particularly bronze and copper. The process can occur naturally or it can be hastened and controlled to some degree. Accelerated patination has been practiced for hundreds of years – in imitation of natural effects, and also because patinated metals can look very attractive.

David Harber is probably best known for vibrant blue patinations as on the Mimeo Cascade water feature above. But we can patinate to a more natural green colour as well as a brown finish that we call antique tan which can be darker or lighter. Patinations can also be mixed for an appealing mottled effect. See below for examples.

Below, we talk to Sam Burghard, Laura Smith and Max Chawner-Davis from the Finishing Team about how they create ravishing patinated effects on David Harber's pieces.

When it comes to patination processes, people just won't tell you their secrets.

Sam Burghard, Finishing Team Leader

What are the key elements behind beautiful patination?

1. Conditions

For a patination to be beautiful, the conditions need to be right. There are a lot of variables that may affect the final result: temperature, moisture, humidity, sunlight, moisture on the brush, how quickly you work, how much time is left between applying layers, contamination from other materials such as dust or sand... It is about knowing which variables will affect the patina.

With the right conditions, the patina will occur as it is meant to occur.

2. Art

There's a difference between knowing the process by following the instruction on a guide book, and having a real feel for patination.

Here at David Harber, we know what effect the different variables will have on how a patination is going to look because the knowledge is there. But it took years and years of patinating to make us experts in this art. It is one of our trade secrets.

In the past people had recipes for patination using certain compounds found in nature like stallions urine, or even drunk people’s urine! People started using these materials for door handles and other items as they tried to understand why materials like copper and bronze were tarnishing.

By trial and error and by changing the processes, people acquired the know-how we have today. But of course now we use chemicals.

So good patinations don't come from talent, but from in-depth understanding. It is a very niche knowledge that each staff member needs to learn by doing.

Blue verdigris patination on bronze armillary sphere, blue verdigris on Mimeo water bowl, wall sundial with mixed blue & antique tan patination, dark antique tan on armillary sphere

Armillary sphere with bright blue verdigris patination
Vertical sundial on garden wall
Mimeo water feature nested in planting
Dark tan patination

What are the stages you need to go through?

It depends on the finish as each finish will have a different process.

But – to use the Mantle sculpture as an example – the first stage of the patination is to sandblast the outside which is the part that gets the blue verdigris patina. The point of sandblasting is to clean and open the metal so that it accepts the chemicals. The first chemical we use acts as a base layer and it gives the piece a dark appearance; after that has dried, the second stage is to apply a chemical mix (DH secret source) which brings out the blue verdigris colours; then we buff the surface to give it a protective shine.

The whole process (plus gilding the interior) is applied to the two separate halves of the Mantle and then we join the two halves together, carefully matching the colours of the patina to hide the join.

Usually, at this stage, the weather conditions will have changed, so we need to replicate the conditions of the original patinating. So if it was raining on the first day, we need to make our environment more humid for the final patination.

What do you think are the key skills required?

Patience, time and passion. It's an ongoing process. The more you learn, the more there is to learn. The more passionate you are, the more you will learn, which helps you become an expert. With the finishes we offer, you do have master them at first. But that isn't really enough. We don't follow exactly the same process every time. You need to learn and develop your skill in order to create different and more interesting finishes.

We also need to remain humble, because the process can go wrong at any point and we need to have the drive to learn from mistakes and improve with them. Because we are manipulating natural chemical reactions, so we are never on the driving seat, we are just giving directions.

You have to remember that once we have finished the patina and the sculpture goes to the client, the weather conditions will change the finish and the look of the sculpture is going to start changing with nature. With time, the metal will do its own thing and the patina will change. That is why we seal patinated pieces with bees wax. But the natural conditions will always affect how the sculpture will look over a long period of time.

Blue patination on a Mimeo water bowl acquires a muted, natural look over time

Muted patination on a Mimeo water feature after years in nature

I have patinated the copper pipes on my new boiler, so they would look nicer!

Sam Burghard, Finishing Team Leader

What do you find most interesting about the process?

Blue patination naturally fades over time on a Mantle in Istanbul, mixed colours with green on copper wall dial, dark antique tan on historic Blagrave dial, light antique tan on Mimeo water bowl

Blue verdigris patination faded with time
Stainless steel Steel Breeze reflecting back border colours
Dark antique tan patination on historic Blagrave dial
Antique tan patination on Mimeo water bowl

How did you start learning about the art of patinating

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