Dream/Zensinsyoji is  adding new colors to their eggs which should ship somewhere in July.  The current egg Japanese eraser has a white shell.  The new egg Japanese erasers have lavender, powder blue and pink shells. If you look closely, the yolk of the blue egg eraser is more orange than the yellow of the lavender and pink egg erasers. We do not know if the production egg Japanese erasers will have this yolk variation.