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Questions where color (wavelengths associated with the visible region of the electromagnetic spectrum of about 400-800nm), or a color change is discussed.

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Explanation for why nickel turns green in hydrochloric acid

formation of the complex cation [Ni(H2O)6]2+ which is green in color. … And also as mentioned by some of the people who answered above, Nickel chloride in anhydrous form is yellow in color whereas, its hexahydrate form has a distinct green color. …
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