Nanoparticles have not just been out a few years...they are everywhere and we breath in billions of them daily. It simply means they are small. The technology developed recently is the ability to manipulate and control them. I of course can't say all chalk is safe (imported chalk is regulated just like domestically made chalk in the US...at least legally) but even if a company is actually employing true nanotechnology (I'm skeptical that it's any more than marketing hyperbol) it doesn't mean it's dangerous. Things like excessive lead content that comes as a normal part of the mining and manufacturing and isn't monitored by an unscrupulous manufacturer is probably a far greater, but still minuscule risk to a pool player.This is actually a very valid question. We know they are using Nanos in some brands already and they give lead the 8 ball and second hand smoke the 7... They are not controlled the same in other countries... In the USA you MUST communicate the hazard and there are guidelines for just the handling..
https://www.osha.gov/dsg/nanotechnology/nanotech_standards.html
Of the chalks I am 100% sure of you have Zen Nano, Joy Dustfree or Dustless and now Sniper... This is straight out of the new Sniper ads. "Contains a much finer particle size than standard chalk · Reduced cue tip wear - thanks to Nano-dispersity of chalk ·"
Comes down to if you cannot see the residue it's not wizardry it's science.. Nanos have been out a few years but are still so new no one considers them in simple products like billiards chalk. We are far from the colored sand of tweeten and silver cup now... Brave new world..... All new dangers....
Don't lick the cube too often and if you clean tables for a living every day wear a mask or get a good filtered vacuum.
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