silver!
Nickel is a metallic and silver-ish color, just like the US coin, the nickel (worth 5 cents).
The color of a US nickel is silverish. US nickels are actually made of 75% copper, but the silvery color of the remaining nickel 25% predominates.
The flame color for nickel sulfate is green. The green color is due to the presence of nickel ions in the compound.
Nickel-colored, which is a dull silvery color. The cladding is made of nickel and copper.
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The flame test for nickel produces a blue-green color flame.
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Nickel nitrate typically appears as a green crystalline solid.
A neon color, or purple
the colour of nickel chloride is bluish green or greenish.
Nickel is a silvery-white lustrous metal with a slight golden tinge.
By observing other compounds. Nickel salts are often green; carbonates are ... well, pretty much any color, including colorless (white) for sodium carbonate (baking powder) or calcium carbonate (limestone, chalk).