Then there is the strong iodine tincture, which was found in Ramlal's house. This Latin word also gives us the common English word tint. It is interesting that the word tincture is applied only to alcoholic solutions. Medicine and dyeing may appear to have no connection at all, but in fact there is an interesting link. In pharmacy alcoholic solutions are commonly called tinctures because many dyes will dissolve in alcohol but not in water.
Tincture of iodine is reddish brown in color.
Oh, the information is interesting indeed. Iodine vapors too have a characteristic odor and taste and are intensely irritating to the eyes, mucous membranes, and skin. Ppm, as you know stands for Parts Per Million. Even at this concentration, i.e. 0.1 ppm, some people may experience eye irritation. Higher concentrations may lead to excessive tearing, tightness in the chest, sore throat, headaches, irritation of the respiratory tract, and water-logging in the lungs, similar to that seen with chlorine gas exposure.