I just tested dropping a couple marbles 5 feet in the air to check if they easily crack and they held up pretty well. Also tested in a glass carboy filled with water and didnt look like they can cause much harm. Anyone have any experiences with chipped marbles or damaged carboys from using marbles?
How do you know if a marble has lead? I bought 10 lbs of used marbles from a person on Ebay. They are the non-collectible leftovers from sifting through garage sale finds to find the good ones.
Just contacted the supplier of glass marbles for Michael's and they confirmed that their marbles are made from 100% glass and do not contain any lead. So some good news there...