Chlorate of Potash tablets were used to cure mouth ulcers. They were available without a prescription from chemist shops. They were small white tablets and were packed in small flat glass bottles.A small flat glass bottle which contained tablets. There is a metal screw top and an oval white label with navy blue printing.TABLETS / CHLORATE / OF POTASH / 5 Grschlorate of potash, m. j. dear - chemist, chemists, pharmacists, medicines, george evans collection