Is Tutton's salt vegan?

Nickel Dipotassium Bis(sulfate) is also known as Tutton's salt.

Nickel dipotassium bis(sulfate) and diammonium nickel bis(sulfate) are inorganic double salts (Tutton's salts) formed from nickel sulfate combined with potassium or ammonium sulfate. They are synthetic mineral compounds with no animal or plant origin.

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