“…Firstly, the added water may increase the electrical conductivity of the propellant, which would suppress charging. This inverse relationship between conductivity and charging has been reported for organic (Dacre & Hetherington, 1998) and aqueous (Rosell, Gonda, Schuster, & Liu, 2002;Vaaraslahti, Laitinen, & Keskinen, 2002;Yatsuzuka, Higashiyama, & Asano, 1996;Yatsuzuka et al, 1994) liquids. However, it is unlikely that the minute amounts of spiked water added would have affected the bulk properties sufficiently to produce the effects observed through this mechanism.…”