Andrew Zarnke and colleagues have analyzed the physical and chemical characteristics of canisters of McIntyre Powder. Their results are now published in the Journal of Occupational and Environmental Hygiene (see "JOEH McIntyre Powder analysis" under "Links").
One of the critically important findings from this research is that the size of McIntyre Powder particles is extremely small. McIntyre Powder was found to be comprised of particles that are in the fine particulate and ultrafine particulate (nanoparticle) size range.
Inhaled nanoparticles have the potential to enter the bloodstream from the lung and travel to other areas of the body. Future research on the potential health consequences of McIntyre Powder inhalation will continue, now that we have a solid understanding of its physical and chemical properties.