text: Nevertheless , the iodide in tincture of iodine used as a water disinfectant does supply more than adequate nutritional iodine , perhaps 30 or more RDA per liter or quart . Application of tincture or Lugol 's to the skin also results in absorption and bioavailability of some moderate fraction of the iodine .
simplified: Tincture of iodine is a disinfectant .