LOL & 'God Bless You'. Heidi! So neat to see you in 'lab' mode!
I don't know what you consider 'plain' ribbon, but that's ok. You've provided me with sufficient info to respond--2 thumbs up, fellow explorer!
My preference for coloring ribbon with ink is (usually) to start with a woven material--as opposed to an extruded. I like the ribbon to have a bit of natural fibre, but many synthetics will accept color from inks & paints.
Far as 'matching color'? Try starting with a ribbon color that allows you to add the ink color without having to start with white ribbon as the base. Say you want a warm 'pumpkin orange'. I might use a light yellow ribbon as my base & go from there.
And 'how' I dye the ribbon is also important. If I need lots of yardage, I might do a 'dye bath'--otherwise I prefer to alter the ribbon's color by non-bath dying.
One thing I remember from my 'dye-ing' days? The color changes when the material is dried.