Patent ID: 7726896

Claim:
An apparatus for enabling a marker pen to produce in a line or succession of lines a uniform and consistent color change from one color to another color, the apparatus comprising: a source having a fluid absorbent nib containing a liquid or dye of a first color; a marker pen having a fluid absorbent nib containing a fluid or dye of a second color; and a tubular docking member including at one end the source and its nib, and open at its other end to receive and engage the nibbed end of the marker pen, the length of the docking member being such as to enable the marker pen selectively to be placed in touching contact with the nib of the source to cause liquid or dye to pass between the nib of the source and the nib of the marker pen; wherein a user of the marker pen is enabled to produce in a line or succession of lines a uniform and consistent color change from the first color to the second color.