I really need to post these earlier in the day and not wait until late at night -- trying to photograph my essentially lavender yarn under artificial light ends up making it look denim blue. Still, it's not until the end of the day that I can really see the progress.
Day 7: Here you can see the single is a visual blend of the purple, turquoise, and white fibers in the roving:
Day 8: Here... not so much. Camera only wants to pick up the blue.