You might be interested in this great post by Marty Fouts: https://blender.stackexchange.com/questions/253936/what-does-the-mixrgb-or-mix-shader-node-factor-do

You might be interested in this great post by Marty Fouts: https://blender.stackexchange.com/questions/253936/what-does-the-mixrgb-or-mix-shader-node-factor-do-exactly/253944#253944 https://blender.stackexchange.com/questions/253936/what-does...