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Possible Answers:
Iodine.
Last seen on: Daily Celebrity Crossword – 4/1/20 Wayback Wednesday
Random information on the term ” Iodine”:
Tincture of iodine, iodine tincture, or weak iodine solution is an antiseptic. It is usually 2–7% elemental iodine, along with potassium iodide or sodium iodide, dissolved in a mixture of ethanol and water. Tincture solutions are characterized by the presence of alcohol. It was used from 1908 in pre-operative skin preparation by surgeon Antonio Grossich.
In the United Kingdom the development of an iodine solution for skin sterilisation was pioneered by Lionel Stretton. The British Medical Journal published the detail of his work at Kidderminster Infirmary in 1909. Stretton used a much weaker solution than that used by Grossich. He claimed in 1915 that Grossich had been using a liquid akin to Liquor Iodi Fortis, and that it was he, Stretton, who had introduced the method using Tincture of Iodine BP(?) which came to be used across the world.
USP Tincture of Iodine is defined in the U.S. National Formulary (NF) as containing in each 100 mL, 1.8 to 2.2 grams of elemental iodine, and 2.1 to 2.6 grams of sodium iodide. Alcohol is 50 mL and the balance is purified water. This “2% free iodine” solution provides about one mg of free iodine per drop (“2% free iodine” is based on the quantity of elemental iodine, not sodium/potassium iodide; 1.8-2.2 grams I2 in 100 ml water corresponds to 0.070919-0.086679 M I2 [MW = 253.80894 amu]).