Contraction. - Iod.
For. names: German, Jod; French, lode.
This element, obtained principally from the ashes of sea-weeds, may be procured from the operative chemists as re-sublimed Iodine.
Characters and Tests. - In laminar crystals, of a peculiar odour, dark colour, and metallic lustre, which, when heated, yield a beautiful violet-coloured vapour; very sparingly soluble in water, but freely dissolved by alcohol, by ether, and by a solution of Iodide of Potassium. The aqueous solution strikes a deep blue colour with Starch. It sublimes without leaving any residue, and the portion that first comes over does not include any slender colourless prisms emitting a pungent odour. 12.7 grains dissolved in an ounce of water containing 15 grains of Iodide of Potassium, require for complete discolouration 1,000 grain measures of the volumetric solution of Hyposulphite of Soda.
Preparation. - Solution in rectified spirit, forming the lx attenuation.
N.B. - It must be borne in mind that there is no so-called mother tincture of Iodine, as φ represents the crude substance. The 1x tincture, as stated above, is the strongest homoeopathic preparation. It is thought desirable to call attention to this, as some misapprehension has existed.
Reference to Horn. Proving. - Chr. Kr., iii.
Proper forms for dispensing. - 1x, Tincture only. 1 and upwards, Tincture, Pilules, or Globules.