Material in shade of blue is if you start adding texture not working properly.
Look at the picture attached.
On and using the same node.
We wanted to use it this blue light in this material node.
But blue is does not show up.
Unreal engine r when connecting nodes RGB at if there is no they don’t show up?
You are taking RGB color to alpha channel. Alpha is just scalar so only R is used from those RGB. If you want to use texture alpha then you need to use 5th pin.(bottom gray one)
I knew that Alpha is just scalar so only R is used from those RGB.
But that accepting, based on R isn’t even think about it.
By adding all G and B, and R (R+G+B=)gray color to plug the surprised and thought that this.
I am very happy that a for Thank you for me! 
