US Patent 7975730 Colouring apparatus

Coloring apparatus comprises a first marker pen having a housing including an absorbent nib containing a liquid or dye of a first color, and a second marker pen having a housing including an absorbent nib containing a liquid or dye of a second color. The housings of the marker pens are dimensioned and shaped to engage opposing end portions of a tubular docking member with their absorbent nibs spaced one from the other. Means are provided to enable relative movement to take place between the pens while in position within the docking member thereby causing the absorbent nibs selectively to make contact with one another within the docking member and to be released from such contact.