It crystallizes in dark purple-red prisms, isomorphous with potassium perchlorate.
In addition, Iraqi attempts to buy ammonium perchlorate, an oxidiser for solid propellant missiles, were successful, at least on paper.
Chemically pure chloride of potassium is most conveniently prepared from the pure perchlorate by heating it in a platinum basin at the lowest temperature and then fusing the residue in a wellcovered platinum crucible.
Thallous Perchlorate, T1C10 4, and periodate, Tl10 4, are interesting inasmuch as they are isomorphous with the corresponding potassium salts.
Perchloric acid is best prepared by distilling potassium perchlorate with concentrated sulphuric acid.
