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Ok the best way for you to understand this is too look at a colour cheese diagram... you'll probably find one if you look up light and spectroscopy....


copper salts are a blue green colour because they absorb light at a wavelength of between 580-630nm (the colour orange)... by looking at the colour cheese you will see that directly opposite the colour orange is the colour blue-green...

zinc salts however do not absorb light at wavelengths between 400-700nm... the human eye is only able to detect wavelength spectrums from between 400 nm to 700 nm and therefore it will appear colourless to us because we simply can't see it!

hope this helps you some, best of luck in your studies
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