Question: has anyone done extensive testing on any fountain pen inks?

I don't mean the standard Mountain of Ink style, sample card, writing sample, etc. visual comparisons. (I'd like to call this subjective measurement, but chromatographic measurements aren't subjective if done in a controlled manner.)

I am thinking more objective testing: viscosity, density, flow rate @ a given line width, etc.

I was thinking about this type of testing tonight, and it seems to me that there are a lot of factors that would need to be controlled: temperature, air pressure / barometric pressure, nib consistency, friction (aka heat), etc. Given what I was thinking this could be an interesting experiment, if someone wanted to undertake controlling all the variables, and implementing the controls necessary for consistent results.

There are some fountain pen-capable pen plotters that could be used for reproducible strokes, like the AxiDraw, though I haven't seen a mount capable of providing a specified level of pressure.

I'd think that one would want an enclosure, the way some 3D printers have, to avoid air movement.