Why is the iris of an eye colorful?

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Why is the iris of an eye colorful?

In: Biology

The pigment in the iris (called melanin) is what makes the iris opaque. Most membranes in the body that are as thin as the iris are translucent and what wouldn’t keep the light out (aka work). Different people have different mutations in genes which influence the production of melanin, and that results in eyes of different colors.