<p>A self contained multiple color writing pen has a single writing tip for dispensing a user selectable variable color ink to paper or other surfaces from an internal mixing chamber. Several internal ink reservoirs each having a different color ink, supply their ink to the mixing chamber. A user may easily change the selectable writing color even as he writes by manually moving a rotatable thumbwheel on the pen and the dispensed ink output changes quickly in response to such thumbwheel input. The number of colors selectable by a user is seemingly infinite and includes the entire color spectrum.</p>
