Solomon L M, West D P, Fitzloff J F, Becker A M
J Invest Dermatol. 1977 May;68(5):310-2. doi: 10.1111/1523-1747.ep12494577.
Blood and brain levels of gamma benzene hexachloride had been measured following topical application in guinea pigs. Levels increased with number of application, and the concentration in brain was at least 10 times greater than in blood.