Every time I go up by the river I pick up little pieces of glass. mostly for safety purposes but sometimes I do find something old and odd and I'd like to keep. I've never thrown away any of the glass of brought home so I've decided to try to do a little experiment with it. I've broken it into several little pieces added it to my rock tumbler and I'm going to let it tumble for about a week and see what happens. To the tumbler I added enough glass to be about a third full. The glass pieces were no bigger than a quarter to half dollar. I added water to cover the glass and a little play sand. Stand by for an update later this week.