FIG. 1 is a front perspective view of a solid ink stick for a color printer showing the top surface and the contour of the side surfaces of my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a side elevational view thereof, the opposite side being identical; and,

FIG. 4 is an end elevational view thereof, the opposite end being identical.

The broken line portions of FIGS. 1, 3, and 4 are environmental only and form no part of the claimed design.