Cartwheeling or no cartwheeling...that is the question...
Just curious. Back in my ancient history as a collector, I remember the term "cartwheeling" or cartwheel effect, being used on silver coins (mainly silver dollars) in a high state of preservation. The term referred to how the luster on the coin flowed evenly around the circle as you rotated it under light as opposed to just reflecting the light back. (Poor explanation but I hope you get the idea.) Once the surfaces of a coin are sufficiently disrupted, the cartwheel effect can not be replicated. Original luster would "cartwheel', while more circulated or cleaned coins would not cartwheel. Is there a "new term" for this effect or do the pros still use it. Is it unique to silver (and perhaps gold) and how does it impact grading?