What color will blue and purple become together?

What color will blue and purple become together?

If it's blue and purple (pure blue and pure purple) in art, maybe we can say that blue + Purple = Red + Blue + blue. Theoretically, it's just that this color will be more bluish
Optically speaking, the meaning is even more unclear. It depends on what color you are talking about, blue and purple. If you are a little bit, you will be a lot worse. Understand the sentence "a little bit worse, a thousand miles lost"