What color mix with orange created blue?

Well, blue is a primary color so you don't really "mix" other colors to get that. I think green would be your best answer, but like I said. Red, yellow, and blue are your primary colors and you cannot get a perfect red/yellow/blue by mixing colors. 
Fun fact: orange and blue are complimentary colors.

Purple can be mixed in with orange but you will not get a true blue.

These traits are all equally important in recognizing the validity of artwork mainly due to an artists' consistent style and reputation which they have developed over a lengthy period of time. most famous paintings contain specific characteristics of the artist who created it. an appraiser would pay close attention to certain key elements within the painting, as well as an accuracy in measurement and color shade. blended textures and outlines are essential in recognizing an authentic piece from a copy. signature and imagery exist in epic proportions to balance out each trait as they coexist in harmony, depending on preference and style of each artist. no two original pieces are virtually identical, although it may be almost impossible to see discrepancy with the naked eye.