What is this node usually called? I'm trying to find the Color Factor node shown below. It's typically already added in there attached to the Principled BSDF by default, but from time to time I have no idea where to find the node once I remove it. 
I'm on Blender 2.91.0
Color MixRGB Shader Node

Looks like a Color &gt; MixRGB  shader  node.  Has its blend type set to &quot;Multiply&quot; and has been renamed to &quot;Color Factor&quot;.