Here, I started with green and blue commercial Merino roving.
I peeled off thin layers of green and blue fibers and mixed them together in my hand beforre placing them on the bed of the Licker In. I just tore off fibers, mixed them, tore off some more, so that the carder would pick up mixtures instead of chunks of color.
I watched to make sure the Licker In was picking up thin strands of fiber so that the colors would build up on the drum blended together more evenly. I also made sure I applied the fibers to the Licker In right in the center so that a rope of roving would emerge when I removed the carded fibers.
After I carded all of the fibers I wanted, I stopped the machine and began peeling off the roving with the wooden Doffer Stick or knitting needle pushed along the edge of the metal seam of the carding drum.
I ended up with a perfectly blended rope of roving in a blue/green color - a perfect mixture of the blue and green Merino I started with.
Below is a photo of the roving I started carding on the outside with the carded roving placed between the two of them.
Blue plus green equals Blue/Green. Amazing!!