The purpose of this variable parameter is to simulate imperfections like fingerprints and or bad cleaned surfaces. This is a very subtle effect and is more appreciable in dark (preferable shiny) surfaces.
Controls whether or not there are going to be smudges over the surface.
From left to right, values were: 0.000 | 0.500 | 1.000. The rest of the parameters were left as default.
Min = 0 | means no smudges
Max = 1 | means the maximum preset amount of smudges
Interpolation | between 0-1 is a linear opacity transition
Default = 0
Adds a grunge texture that simulates bad cleaned surfaces and micro surface imperfections.
From left to right, values were: 0.200 | 0.600 | 1.000. The "Fingerprints" and "Swirls" have been set to 0. The rest of the parameters were left as default.