I have a marble in my collection that was identified as a Vitro Confetti by the later Bo Stiff. Right now I can’t find it. It’s on clear baseglass with multiple colors of grit. I think what sets it apart from a Vacor is that the Vacor’s grit is on the surface and the Vitro has a smooth surface. It’s probably 3/4ths or 7/8ths. I think there was a Lady that put together a short run to make these. Does anyone know more these about marbles ?