[hemmer]

I wonder how much of a role wetting/capillary effects play in this? The liquid interface will distort as it approaches the object, and will try to meet at a certain contact angle (based on surface tensions etc). Correcting for this might help improve the resolution of the scans?

[derefr]

I would predict that it would be rather difficult to dip-scan a sponge. Might work if it was fully saturated (waterlogged) in advance, though.