Sometimes it is nice to plot a drawing with one entity or one group (layer) in color. Rather than using a separate CTB file with color pens, or dedicating pens in your CTB file to color, you can simply force any item or layer to plot in color. To do this, pick an index color, switch to the True Color tab, and toggle one of the RGB numbers up or down a digit. This works with all versions of AutoCad.
Notes from Cadalyst tip reviewer R.K. McSwain: Note that True Color was introduced in AutoCAD 2004. Also, if you normally control lineweights with your CTB file, you'll have to adjust the actual lineweight of the entities that are assigned a True Color.