I am looking to flush my light light black and my light black lines in my epson 7880 so rather than just print one color I was thinking I could convert photos to black and white and only use that color. (Does that make sense and is it possible?) or will the printer attempt to use the other cartidges for graients rather than less and more of the desired color?
Would one choose black and white from the layers menu and then a bo omes up and I can choose with the eyedropper any color. In this case I am choosing the fill color already selected from the 8 color purge chart.

Thank you!