Was a corrosive substance such a stearic or oleic acid surfactant the cause of corrosion near the filling port on EPG3? (Oleic acid is often used in ferrofluid as a surfactant/suspending agent in the mineral oil or kerosine base) Or was Stan just messier in applying soldering flux near the filling port? Think -Verdegris- and copper organics used as early paint pigments
link to making own ferrofluid they mention the oleic acid
http://chemistry.about.com/od/demonstrationsexperiments/ss/liquidmagnet.htmCommon ferrofluid surfactants
Surfactants are often used to coat the nanoparticles include, but are not limited to,
oleic acid
tetramethylammonium hydroxide
citric acid
soy lecithin
See Dynodon disc for ferro fluid photo.( FeroTec source EFH1) DSC_0013 (SMEPG003.013) or DSC_0062 (SMEPG003.014)
It's just
curious that the filling port is
the one most noticablely corroded green ((see also DSC_0184(SMEPG003.009)) It appears as a spill from the top.
Of all the soldered connections the filling port is the one most corroded and green, not the other comparable connections, or the magnetic coils to brass ring soldering

on EPG3 , or on EPG2 or EPG1 devices
Ferromagnetic paints
absorb radar energy. Stealth anyone

Ferrofluids have an exceptionally high magnetic susceptibility and the critical magnetic field for the onset of the corrugations and distortion in surface shape can be seen using a low gauss magnetic bar or
coilA magnetorheological fluid (MR fluid) is a type of smart fluid in a carrier fluid, usually a type of oil. When subjected to a magnetic field, the fluid greatly increases its apparent viscosity, to the point of becoming a viscoelastic solid. Importantly, the yield stress of the fluid when in its active ("on") state can be controlled very accurately by varying the magnetic field intensity. The upshot of this is that the fluid's ability to transmit
force can be controlled with an electromagnet, which gives rise to its many possible control-based applications. wikipedia
Theory
hmm.... so by mangetizing a magnetorheliological fluid in a circular tube the higher viscosity"piston" drives the
lower viscosity fluid (less magnetized) thru the tube and by controlling the magnetic coils like a rail gun ,extremely high velogities of the liquids are acheived to "any degree desired" and 'magnetic fields moving past the pickups generate the electricity' or so the theory goes --- MHD for subs plasma for trb3
think paramagnetic effects
see rwg for comments regarding red discoloration on epgs
see DSM (Dealership Sales Manual) on EPG ("slurry")
see Dave B/ Dan Deshon at hhoinfo