Abstract: A marker apparatus for placing an elongate mark on a marking medium surface, including a first chamber having a first chamber proximal end, a first chamber distal end with a first chamber wick port, and containing a first pigmented marking liquid; a second chamber having a second chamber proximal end, a second chamber distal end with a second chamber wick port, and containing a second pigmented marking liquid; a first wick segment in liquid communication with the first pigmented marking liquid protruding from the first chamber wick port for contact with a surface of a marking medium; a second wick segment in liquid communication with the second pigmented marking liquid protruding from the second chamber wick port for contact with a surface of a marking medium; and a chamber retaining structure retaining the first chamber and the second chamber so that the first wick segment is positioned substantially adjacent to the second wick segment.