A writing tool including a plurality of cartridge members (4a-4f) containing volatile marking substances therein and capable of applying said marking substances onto an article comprising: - at least one case member defining an interior therein and forming at least one opening which provides fluid communication between said interior and an exterior of said tool; - said cartridge members (4a-4f) which are movably disposed in said interior and each of which includes a body and a tip, wherein said body contains one of said substances therein and wherein said tip applies said one of said substances onto said article; - at least one cap member which is disposed in one end of said case member and includes a plurality of caps each of which is capable of changing its configuration between at least one off state and at least one on state, wherein in the instance that said tool is not in use said caps close said opening in said off state, and wherein in the instance that said tool is in use said caps are capable of opening at least a portion of said opening in said on state, wherein said cap member and said caps thereof are configured to enclose all of said tips of said cartridge members (4a-4f) in said interior in said off state, and wherein said opening is sized to allow only one of said tips of said cartridge members (4a-4f) to move therethrough to an exterior of said interior in said on state and is further configured to simultaneously keep the rest of said tips of said cartridge members (4a-4f) enclosed in said interior; and - at least one actuator member which is configured to actuate said cap member and at least one of said caps thereof to make it movable between said off state and on state, to selectively store said cartridge members (4a-4f) in said interior in said off state, and to move said cartridge members (4a-4f) in said on state in such a way that said tips of said cartridge members (4a-4f) are exposed to said exterior through said opening one at a time. - at least one case member defining an interior therein and forming at least one opening which provides fluid communication between said interior and an exterior of said tool; - said cartridge members (4a-4f) which are movably disposed in said interior and each of which includes a body and a tip, wherein said body contains one of said substances therein and wherein said tip applies said one of said substances onto said article; - at least one cap member which is disposed in one end of said case member and includes a plurality of caps each of which is capable of changing its configuration between at least one off state and at least one on state, wherein in the instance that said tool is not in use said caps close said opening in said off state, and wherein in the instance that said tool is in use said caps are capable of opening at least a portion of said opening in said on state, wherein said cap member and said caps thereof are configured to enclose all of said tips of said cartridge members (4a-4f) in said interior in said off state, and wherein said opening is sized to allow only one of said tips of said cartridge members (4a-4f) to move therethrough to an exterior of said interior in said on state and is further configured to simultaneously keep the rest of said tips of said cartridge members (4a-4f) enclosed in said interior; and - at least one actuator member which is configured to actuate said cap member and at least one of said caps thereof to make it movable between said off state and on state, to selectively store said cartridge members (4a-4f) in said interior in said off state, and to move said cartridge members (4a-4f) in said on state in such a way that said tips of said cartridge members (4a-4f) are exposed to said exterior through said opening one at a time.