Mixing colors like in Phoenix?

[dv2000]

You're trying to blend by material ID which is not possible because material IDs are integers.

You need to blend custom properties, then use them to blend between maps using a Mix map and a Gradient Ramp...same way it's done in the color blending example in the official scene files.

Thank you
Do you know if it works with octane?  And can three or more different paints mix?