There isn’t any electric charge in any of my materials but some are slightly ferrous. running a magnet over it is the worst thing you can do as your now magnetizing it. Thousands of bags have been installed on layouts around the world without any problem and now you causing alarm. All of my materials that are volcanic have ferrous properties not magnetic properties. When you run a magnet over them you now make them magnetic. I knew this my first year in business and did test and found no problems. At a GATS show, I ran engines over loose unglued ballast for two days and nothing happened.