Why are all the parts that I join onto a model colored differently when in sculpt mode?
Are any functionalities affected? How do I make it all one color?
Have you joined them with ctrl J in object mode so it is 1 mesh?
Check your viewport shading settings
If you have the above selected and they are different objects, then each object will have a different colour
Those are “Face Sets”. They are a way to mask different parts of the mesh, which you can define in various ways. When you join a new part it automatically assigned its own face set.
If you just want to make them invisible: disable the overlay in Sculpt Mode in Viewport Overlays > Face Sets.
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