Leather has been dyed for ages.
Raw leathers slowly change colors as they are used.
Right now, my shoes have some white leather on them, belt is black leather, watchband is a cordovan (red brown), holster is a mahogany brown. The backside of the holster and the belt are both a tan color, but the back side of the holster has some nice darker browns where it sets against my body.
In my wife's closet, you can find leather shoes in white, red, blue, navy, black, green, etc.
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My point is that leathers can come in almost any color under the rainbow.