SUMMARY
As is readily apparent in the DC Conductivity measurements, there is virtually no measurable current flow through dry or pre-soaked hair at any of the voltage settings from 100 DCV to 5000 DCV. This suggests that hair has extremely high electrical resistance and does not appear to conduct DC current even under very high voltage potentials.

The AC voltage tests yielded similar results, with only the inherent AC (60 Hz) leakage of the test jig being measured during tests with dry hair.

Based on these tests, we can conclude that it is not possible for untreated hair to pass measurable DC current above 0.1 microamperes, even after it has been pre-soaked in the various test solutions. The effects of sub-microampere DC currents (less than 0.1uA) on the hair follicle have not been investigated, but it is unlikely that such small currents would have any effect on the papilla or hair growth cells. In practical needle-type electrolysis, the lowest DC currents generally used are typically around 0.1 milliamperes (1000 times higher) and are sometimes applied using the multiple needle technique. At this level of current, treatment times ranging from 2 to 4 minutes per hair are not uncommon, often necessitating the use of multiple needles simultaneously.

Soaking or coating the hair shaft with an electrolyte can, of course, provide a conductive path along the outside surface of the hair, but studies ¹ indicate that such applied current would likely dissipate through the skin at the follicle opening and not penetrate fully to the papilla. Any test of hair conductivity must eliminate the effects of possible current flow along the hair surface through a conductive coating.