Label four cups Water, Vinegar, Iodine, and Indicator. Use the iodine solution left over from the demonstration or make a new solution by adding 5 drops of tincture of iodine to 50 mL of water. Place ...

Many other readers hastened to tell us that we should have mentioned clear iodine. It is also called decolorized or “white” iodine and won’t stain the skin the way brown tincture of iodine does.

Tincture of iodine is dark brown, and it can stain, so not everyone will want to use it on the face. Other readers have also reported success applying tincture of iodine to fungus-infected nails. Q.