There are far too few reviews of grey ink on this blog. Here is another one to vary things a bit!
This scan was done on an HP Deskjet F4280 at 600dpi.
Because these scans are done with a light emitting printer, actual
colors will, more likely than not, be slightly darker than they may
appear, here. The
colors shown, here, are probably a bit more reminiscent of what the ink
would be like under a bright light or if it were held up and viewed
with a light behind it.