How can I make scratches in paint so that they reveal the metal underneath? I have a metal water bottle coated in green paint.
I am using an overlay to add scratches. I have colour and normal maps.
However, this just adds white scratches.


I want to make the scratches reveal shiny metal underneath, as if the scratch removed the paint.
Is there some way I can use these maps to indicate metalness?
Or can I use it to mix between a metal and paint texture?
Thank you.
Use the texture as a mix factor between two different shaders.



The rest is just adjusting the lighting.