Decolorized iodine, who'da thunk? When I was a kid, the way you knew the iodine hit was the way it stained your skin. No more. Sometime in the last 25 years, someone figured out how to take the color, and thence staining power, out of iodine. Who? The interwebs stand moot.
Why? So you don't have to worry about staining your clothes? Maybe sometimes additional factors inspiring more safety when handling a dangerous substance are a good thing . . .