From
the Swatches panel menu, choose New Mixed Ink Swatch. (This option
is dimmed until you add a spot color to the Swatches panel.)
Type a name for the swatch.
To include an ink in the mixed ink swatch, click the
empty box next to its name. An ink icon appears.
A mixed ink swatch must contain at least one spot color.
Adjust the percentage of each ink included in the swatch
by using the slider bar or typing a value in the percentage box.
To add the mixed ink to the Swatches panel, click Add
or OK.
Colors on a monitor often look different
when they print. For best results, ask your commercial printer to
output a sample of any mixed inks you want to print.