Is this correct using colon like this?

[teleostomi]

To achieve the maximum number of rebounds, the angle between a spinning stone and the water should be about 20 degrees1, advises Clanet: “This is the magic angle.”

Is this colon appearing above a correct way of using colon?

[Mister Micawber]

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Yes, that's one way of presenting the Clanet quote, Teleostomi.
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