About the Fate of Free Iodine Upon Application to the Unbroken Animal Skin: An Experimental Study
Nyiri, W and Jannitti, M.
J Pharmacol Exp Ther 45:85-107, 1932
"The paper serves as experimental evidence for the penetration of Iodine through the unbroken animal skin." “We never found Iodine to penetrate in its free state, but only as iodides.”