Spotted materials directly maps the 3D Perlin's noise function to a gradient between two colors.
Here you have another spotted effect:
spotted(royalblue, color(44, 71, 39), 4, 2, 0.0, 0.4, 3)
The Spots pigment provides the same functionality, and can be used with the MetalPigment material to simulate a metalic look.
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