Color choices are limited for cartridges from Parker, blue and black only. If you want to open up your color options, try an ink converter and some new bottled ink in many, many colors.
Parker Quink cartridges are designed to fit perfectly in the barrel of your Parker fountain Pen. If you did not receive an ink converter or have misplaced it, they are available below. Then your can order any brand of bottled ink. Colorado Pen bottled ink arrives in a huge 90ml bottle. Private Reserve also has many bottled ink color options and some new ink types.