As an English speaker, I see several ways this could be written, but it would depend on the context of the sentence. For example, if i was asked "What color is this?", I would reply "The color blue", or just "Blue" (we don't generally specify the word "color" because it is obvious that Blue is a color.) I definitely would NOT answer "The blue color" or "Blue color". If I was asked "What shade is teal?" Or "Describe teal", I might say "It is a blue color". However, I think it is much more common in English to use just the color name, or "the color <name>"