I bought a used guitar and this is the saddle that was installed. It is to be replaced because it's too short and the top doesn't have the proper radius. As you can see, the first thing I tried was to glue on an ebony shim but it really needs a properly-shaped saddle so I sanded off most of the ebony.
The tan-colored "blotches" seem to be on the material and don't remove with sandpaper or soap and water...