It's materials science not magic and comes down to the particle sizes as to what you see transferring onto the cueball... Since nano powders cannot be used in the manufacture of chalk in the USA, European Union or Japan because of health risks this is a pretty good clue as to COO... Are several brands out now that use the nano tech, some going back 4-5 years now... When OSHA or their counterpart in EU get around to testing, this may not be available so stock up and don't vacuum your table as the bag won't catch it and everyone in the room will get a dose... Nanos pass thru the skin and lung linings like they are there and go straight into the blood stream.. Spots lead the 5 out...... So far I have seen Joy Dustless, Zen, Sniper and Konllen actually state "nano technology" and more will be coming as more brands have it made.