In the sentence "It also changes the..., which has a brown to tan tint in its original form," the word "tint" is a noun, since it is preceded by an adjective.
The word "tint" can be both a verb or a noun, which is revealed through the context of the sentence. For example, in the sentence, "The dirty windows tinted the room brown," we have "tint" as a verb in the past form referring to the subject "windows."
However, in the sentence "It also changes the color of feldspar, which has a brown to tan tint in its original form," "tint" is a noun. We can be sure of that because it is preceded by the adjective "tan", and adjectives only modify nouns.
Learn more about nouns here:
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