How was the twilight blue color effect in this photo produced

I really wonder, when I see some people showing their creativity, composition sense, and light sense through their photographs. I just came through such a photo now. This is the photo: I saw this

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How was the twilight blue color effect in this photo produced? - Photography Stack Exchange

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Description, Specs, Compatibility, Notes, Product Highlights:, • Provides graduated density from darkish blue at the top to a pink horizon to clear

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How was the twilight blue color effect in this photo produced? - Photography Stack Exchange