Many text books define colloids as having particles in the size range of 1 - 1000 nm. When those books were written no one had ever seen colloidal particles smaller than 1 nanometer because the technology to make such small particles did not exist at the time. Today the technology exists that can produce sub-nanometer sized colloidal particles. The only such technology known to the author is the Meso process developed at the Colloidal Science Laboratory, Inc. Ions are not considered colloidal particles contrary to what is claimed by some producers of ionic solutions.