Part 18
06.2024
My attempts at patinating the copper plating.
In the photo below, you can see how the copper plating looks on a real ship, and I really like this oxidized color (minus the heavy green streaks). In my opinion, this is the exact color Dmitry Shevelev was able to achieve. As I mentioned earlier, after nearly 10 years of searching, I finally found the product he used to achieve this effect. It can only be shipped to me in a week, plus travel time, plus testing time… so I'll come back to this later. For now, I want to show you my own experiments with copper patination.
At a local ship modeling store, I bought six copper plating sheets with pre-made nail head imitations. I chose a scale of 1:72, which is slightly larger than my model's scale, as I prefer the look to 1:96, which seems too small to me. The sheets already had fingerprint smudges on them, which serves as a reminder that during and after application, touching the copper plating should be avoided to prevent leaving marks. To address this, I’m preparing a stand that will allow me to rotate the model without touching its underwater section after the copper is secured.
I’ll go into more detail about marking the plating later, as I progress with attaching it…
…but today, we’ll focus solely on the patination process, specifically, on my attempts to age the copper plating.
Waiting for copper to oxidize naturally (especially in the controlled environment of an apartment) isn’t exactly appealing. Besides, it wouldn’t achieve the look of copper weathered by decades in salt water, so I needed a way to speed up the process.
I didn’t want to experiment with unknown chemical mixtures—though I might end up trying that eventually. I decided to test out some specialized products first. Just to clarify: vinegar, citric acid, and similar acids don’t produce the oxidation effect I need. They leave slight oxidation traces, but they’re usually patchy and look unattractive. I also tried "Green Patina"—an extremely aggressive solution. Both in pure and diluted forms, it gives a very strong reaction, but rather than patinating, it simply darkens the copper to black.
In the photo above: - **Right**: Vinegar-based solution on regular copper; - **Center**: Same solution on polished copper; - **Bottom left**: Green Patina; - **Top left**: Roman Patina (though it produced poor results here, similar to the other methods, I’ve found a way to work with it for more acceptable outcomes).
So, I glued the copper plates onto painted plywood using cyanoacrylate. Then, I applied
"Roman Patina" (undiluted) with a damp paper towel for 30 seconds, immediately blotted it, and wiped off any remaining moisture. Here’s the result I achieved.
And everything would be fine... I liked the traces of green patina in the recesses, and at certain angles, the copper looked pretty good... but from other angles, harsh streaks appeared. In short, this wasn’t the end of it. I wiped the copper with a cleaning agent, which, by the way, completely removed all traces of oxidation, and started over.
Here’s what clean copper looks like.
Then, I treated it with this polishing head for metal.
After that, the surface became rough. However, I'm not sure if I'll do this with the plates I will fix on the model; I still need to test it further.
I applied the
Roman patina again for 30 seconds, then blotted it and immediately dried the remaining moisture with a hairdryer. The result was as follows.
The patina without wiping became much stronger, pale, and with the same streaks. I initially thought the streaks might have appeared from wiping, but they appeared even here. To skip ahead, I'll say that over the week, the reaction intensified, and the copper's appearance worsened significantly, though I regret not photographing it. Once again, I wiped off all the coating and started over.
This time, I experimented with diluting the
Roman patina with water.
In the photo below, on the top left, I applied a 1:1 diluted solution. After waiting 30 seconds, I blotted it, and once it dried completely, I wiped it again with a paper towel dampened in the same solution. I wiped it as if removing the previous layer, until it dried. On the bottom left, I simply applied the 1:1 solution, waited 30 seconds, blotted it, and let it dry without further touch. On the top and bottom right, it's a 1:4 solution, a very weak dilution. I applied it, waited 30 seconds, and just blotted it without further wiping.
As you can see, the results vary greatly. Why 30 seconds, you may ask. Because a shorter exposure (<20 seconds) did not give significant results. And if the exposure was longer than 40 seconds, the patina turned the copper very dark. So, 30 seconds turned out to be optimal. Now, regarding wiping—it’s interesting. If you wipe it, there’s naturally less patina. If you dab and leave it to dry, the green patina appears stronger. If you leave more moisture than needed, the oxidation continues for some time. By the way, I noticed that this process intensifies in the sun and at high temperatures.
In short, I haven’t found a method yet that gives a stable, even, and predictable result without these streaks and stains. On some samples, at certain points, angles, and under certain light, it looks very beautiful. But nearby, there might be sections where it looks absolutely terrible. So, for now, I’m still experimenting and searching, waiting for my "Patina-It" to be sent. If anyone has a working solution, I’d appreciate it if you share it. I’ll be grateful... Meanwhile, I’ll continue with the construction of the galley.