![]() ![]() Tin Bronze – CuSn – Copper with a proportion of Tin added.There are many grades of Brass available and as would be expected, each grade will react in a slightly different manner when we expose it to chemicals. Brass – CuZn – Copper with a proportion of Zinc added.All are copper based alloys with different elements added in varying proportions to give a range of properties it is the copper in these alloys which oxidises and forms the dark and protective layer on the metal. The most common case metals we find are Brass, Tin Bronze (commonly known as Bronze) and Aluminium Bronze (AL-Bronze - not as common). There are doubtless many other very experienced “chemists” who have a wealth of knowledge in this field (we’d welcome your findings, hints and tips too) please therefore don’t assume this is the “bible of patina,” see it more as a head-start to save you time and effort in learning what we already know! The information contained in this blog is offered as a guide only, to give you some base knowledge & pointers prior to you forcing the patina on your own watch. We’ll even give you some tried and tested methods of removing the patina, in the event that you aren’t happy with your results.Īt this stage, we ought to point out that SeriousWatches cannot be held responsible for any damage caused to third party watches, should they be exposed to corrosive chemicals however, as long as you are careful we don’t foresee any issues. Forcing patina can be a lot of fun and can lead to some interesting, unique and fantastic results. If, like us, you are a tiny bit impatient and it feels like your watch is “taking forever” to start patinating, then you’ve probably considered doing something to speed things up a little. The patina we see on our bronze and brass watches is simply a layer of oxide, which darkens and protects the surface of the metal these watch cases start to darken naturally when exposed to the air, but the process is very slow and as such we don’t always realise it is happening! At SeriousWatches, we are always looking for new ways to help our valued customers, so (with the ever growing popularity of Bronze and Brass watches) we think it’s time we offered you all an insight into our experience / experimentations with forcing patina. Hi everyone and welcome to our new blog, A Guide to Forcing Patina. Can be difficult to achieve.PATINA – A BRONZE ODYSSEY Part 1 By Adam CleggĪ ‘SeriousWatches’ guide to forcing patina. Difficulty: This is a hot application.Chemical compound: Ferric nitrate, Copper sulfide.Difficulty: Altering the strength can push the color from golden brown to yellow.Can be combined with ferric nitrate solutions to adjust color. Chemical compound: Copper nitrate, Copper chloride.Can be layered with potassium sulfide or ferric nitrate solutions to adjust color. Difficulty: Several proprietary mixtures available.Chemical compound: Copper acetate, Copper carbonate, Copper nitrate, Copper sulfate.Several proprietary mixtures are available. Chemical compound: Ferric nitrate, Potassium sulfide, Copper sulfide.There are a number of proprietary mixtures. Chemicals have pungent odors and short shelf lives. Chemical compound: Potassium sulfide, ammonium sulfide, hot sodium hydroxide.When some maintenance is performed, bronze sculptures can last centuries and appear as if they were cast in recent times. However, one only has to look at the ancient sculptures that have been residing under the sea for centuries to observe that they are still intact and recognizable. The sculpture, on the other hand, is undergoing surface changes that are irreversible and can damage the original design intention. The copper roof is allowed to oxidize and grow a beautiful green tone that resists further oxidation, as shown on the Berlin Cathedral or the 1909 spire on the Nikolaj Contemporary Art Center. Although the results are similar, the consequences are far different. The rich green color on a copper roof and the oxidation of a bronze sculpture in a fountain are both manifestations of the natural progression of surface decay. Natural green copper patinas form over time via the interaction of moisture, pollution, chlorides, and carbon dioxide on the surface of copper and copper alloys. ![]()
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