Question: Is the most expensive color in the world Blue?, Answer:Yes, Description of Blue: A primary colour between purple and green, Fact1: Blue is a primary color., Fact2: Blue is between violet and green on the visible light spectrum., Fact3: Lapis Lazuli is used to make ultramarine. , Fact4: Ultramarine is a pigment of Blue, Fact5: Processing Lapis Lazuli into Ultramarine is the most expensive of color processes.
Step1: What was the most expensive pigment used by Renaissance painters?, Step2: Is #1 a shade of the color blue?, Wikipedia page for step 1: https://en.wikipedia.org/wiki/Ultramarine, Wikipedia page for step 2: https://en.wikipedia.org/wiki/Ultramarine, not_definitive_answer: True, incorrect_answer: False