A highlighting (or marking) composition, such as an ink, including a non-eradicable colorant, an eradicable colorant; a kit including a first marking instrument comprising the highlighting mixture and a second marking instrument comprising an eradicator fluid; a colorant complex including a colorless or substantially colorless eradicable dye, a non-eradicable dye, and an eradicator; and methods of applying an eradicator to at least a portion of a marking made with a highlighting composition, are described herein.