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How can we physically identify pure copper?

Date: 17 Jun 2014   Posted By: Aamir shahzad     Group: Electronics & Home Appliances    Category: Measuring devices   

Most home appliances such as Motors, Generator, Fan, Compressor and many other devices are using copper for winding purpose. In the market, there are many types of copper, some are pure copper and some are semi copper or not original copper. Can you tell me how can we identify pure copper? Is there any specific way we can check the purity of copper used in home appliances?

Follow this thread to learn tips on how to identify pure copper used in home appliances and motors.

Author: Harish    19 Jun 2014      Member Level: Gold     Points : 4  (Rs 4)    Voting Score: 0

I think we can identify copper wires by doing scratching test. If the wire is of copper, then it must turn "Yellow-Golden Colour" after some scratches.
There may be another techniques to identify copper. I just provided the easiest way and it can be used to identify copper physically. However, wait for other expert's answers.

Author: Paresh Gujarati    21 Jun 2014      Member Level: Gold     Points : 5  (Rs 5)    Voting Score: 0

One of the simplest method to test pure copper is to apply lemon juice over it. Then rinse it with water and it will glow like reddish colour. This is a sign of pure copper.

Second test, you can find the density of the copper by weighing on electronic weight measurement machine and volume by dimension. If the found density matches with that of pure copper, you can surely tell that the copper you are having is pure.

Third test, you should have spectrometer to test the copper sample. Spectrometer will tell you amount of light with exact wavelength when reflected from sample of copper. If this matches with that of pure copper, sample is 100% copper.

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