2/27/2024 0 Comments Black patina solutionThen test it on a scrap of solder or lead came. If it looks insipidly blue, add some more crystals. Here’s how to make-up your copper patina for lead and solder…Īdd some copper sulphate crystals into a plastic bottle containing water. You’ll probably not find it in modern-day chemistry sets because it is poisonous. ![]() So, keep an eye out for old chemistry sets. Making copper sulphate crystals is what you might remember from using a childhood chemistry set or from science experiments at school. You probably already know copper sulphate. You will find it on eBay but also keep an eye open in other places as it is sometimes available as an algicide or a root killer – just be sure to check the labelling that you’re not buying something else or some weird concoction that happens to contain some copper sulphate. ![]() It’s the copper(II)sulphate pentahydrate form that you are most likely to encounter and it is widely available. All very odd really because a city in Louisiana called Sulphur is where sulphur was mined (see ). In the USA copper sulphate is called copper sulfate – they use the word sulfur instead of sulphur nowadays. But, if you’re still using 19th Century chemistry terminology you’ll know it as blue vitriol, or cupric sulphate if slightly less out-of-date. It is less-precisely known as copper sulphate (CuSO 4) which is actually an anhydrous form that works just as well. ![]() The chemical you need is called copper(II)sulphate pentahydrate (CuSO 4.5H 20) and it’s a lovely colour of blue. For a small fraction of the price of a bottle of copper patina solution you could be buying a lifetime’s supply of the active ingredient – and just add water.
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