Thanks about the colors, I am really happy with the result.
Abiut the refraction, is there in the shader, but I always found it a bit too much. I deactivated it on all the example that are on the video but it is completly based on an irrational opinion: I don’t like refraction 
And since it was an irrational thing, the programmer inside my head decided to leave a parameter on the shader in case I change my mind in the future.