Digital BW, The Print

I'm trying to make my first curve.  I'm using a 1280 with UT2 ink on
an XP machine.

I printed the ink limit page in Calibration Mode and just printed the
page again after setting the limit to 80%.  I'm trying to figure out
the  ink density percentages from gray to black.  With UT2 ink there
are four shades right?  From darkest to lightest they are Black,
Magenta, Cyan and Light Cyan right?  The relative densities of Yellow
and Light Magenta should not be figured right?  I don't have Light
Black ink.  I'm somewhat colorblind so I'm never sure if I'm seeing
color or for that matter what color it is.

Thanks for the help.

Tom