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How to Test Pure Copper – 3 Common Methods

How to Test Pure Copper

Pure copper is an incredibly versatile and valuable metal. It has various uses, including as a conductor of electricity, heat, and sound. But how can you be sure that the copper you buy is pure? There are several methods to test pure copper. Let’s take a look at them in more detail.

Visual Test

The most obvious way to test if your copper is pure is to examine it visually simply. Pure copper should be reddish-orange, with no other colors present or visible. If there are any green or black spots on the surface, it’s likely, not pure copper. Additionally, there should also be no signs of corrosion or oxidation on the surface of the metal.

Resistance Test

Another way to tell if your copper is pure is to measure its electrical resistance using an ohmmeter. Pure copper has a specific electrical resistance that can be used as a benchmark for comparison against unknown samples. To measure this resistance, attach both ends of the sample to an ohmmeter and take note of the reading. You can be confident in its purity if it matches up with known readings for pure copper.

Acid Test

Finally, you can also use acid testing to determine whether your sample is pure copper. This involves submerging the sample in hydrochloric acid for a few hours and observing any changes in color or texture that may occur during this period. If the sample does not change color or become discolored during this process, it’s likely that it’s made from pure copper and not some other alloy or material.


Testing whether your sample of copper is pure can seem daunting at first, but by following these simple steps, you’ll soon be able to determine if it is what you think it is accurately! Visual inspection, resistance testing, and acid testing are quick and easy ways to check if your copper sample is genuine and unadulterated by any other materials or alloys. With these tips in mind, you’ll soon have confidence that your supply of pure copper is just that!

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