Over a year ago, I bought some “beads” that are rounded slices of
ostrich shell. As usual, I did not get around to using them right
away, and now several of them have some little black spots on them. I
tried tumble-polishing them for a few hours in my Cerambits and they
got shinier on the outer shell side, but it didn’t remove the spots.
Does anyone know how to get rid of the spots, or are they just
Thanks in advance!